Machine Learning Linkedin Assessment Question Answers

Machine learning

In artificial intelligence, machine learning (ML) is a type of AI that allows software applications to improve their accuracy in predicting outcomes without having to be explicitly programmed. Machine learning algorithms use historical data as input to predict new output values.

By developing computer programs that can access historical data and learn on their own, machine learning is able to access and learn from the past.

Machine learning is often used in recommendation engines. A few other applications include fraud detection, spam filtering, malware threat detection, business process automation (BPA), and predictive maintenance

Machine Learning Linkedin Assessment Question and Answers

1. Your company wants to predict whether existing automotive insurance customers are more likely to buy homeowners insurance. It created a model to better predict the best customers contact about homeowners insurance, and the model had a low variance but high bias. What does that say about the data model?

It was consistently wrong.
It was inconsistently wrong.
It was consistently right.
It was equally right end wrong.

2. What does this image illustrate?

a decision tree
reinforcement learning
K-nearest neighbor
a clear trendline

3. How is machine learning related to artificial intelligence?

Artificial intelligence focuses on classification, while machine learning is about clustering data.
Machine learning is a type of artificial intelligence that relies on learning through data.
Artificial intelligence is form of unsupervised machine learning.
Machine learning and artificial intelligence are the same thing.

4. Your university wants to use machine learning algorithms to help sort through incoming student applications. An administrator asks if the admissions decisions might be biased against any particular group, such as women. What would be the best answer?

Machine learning algorithms are based on math and statistics, and so by definition will be unbiased.
There is no way to identify bias in the data.
Machine learning algorithms are powerful enough to eliminate bias from the data.
All human-created data is biased, and data scientists need to account for that.

5. Your organization allows people to create online professional profiles. A key feature is the ability to create clusters of people who are professionally connected to one another. What type of machine learning method is used to create these clusters?

unsupervised machine learning
binary classification
supervised machine learning
reinforcement learning

6. You created machine learning system that interacts with its environment and responds to errors and rewards. What type of machine learning system is it?

supervised learning
semi-supervised learning
reinforcement learning
unsupervised learning

7. You are using K-nearest neighbor and you have a K of 1. What are you likely to see when you train the model?

high variance and low bias
low bias and low variance
low variance and high bias
high bias and high variance

8. In K-nearest neighbor, the closer you are to neighbor, the more likely you are to

share common characteristics
be part of the root node
have a Euclidean connection
be part of the same cluster

9. You work for a hospital that is tracking the community spread of a virus. The hospital created a smartwatch application that uploads body temperature data from hundreds of thousands of participants. What is the best technique to analyze the data?

Use reinforcement learning to reward the system when a new person participates.
Use unsupervised machine learning to cluster together people based on patterns the machine discovers.
Use Supervised machine learning to sort people by demographic data.
Use Supervised machine learning to classify people by body temperature.

10. Your data science team wants to use machine learning to better filter out spam messages. The team has gathered a database of 100,000 messages that have been identified as spam or not spam. If you are using supervised machine learning, what would you call this data set?

machine learning algorithm
training set
big data test set
data cluster

11. The model will be trained with data in one single batch is known as ?

Batch learning
Offline learning
Both A and B
None of the above

12. ___ refers to a model that can neither model the training data nor generalize to new data.

good fitting
overfitting
underfitting
all of the above

13. ___________ algorithms enable the computers to learn from data, and even improve themselves, without being explicitly programmed.

Artificial Intelligence
Machine Learning
Deep Learning
Traditional Learning

14. Which loss function would fit best in a categorical (discrete) supervised learning ?

kullback-leibler (KL) loss
Binary Crossentropy
Mean Squared Error (MSE)
Any L2 loss

15. Many of the advances in machine learning have come from improved?

structured data
algorithms
time
computer scientists

16. What is lazy learning?

when the machine learning algorithms do most of the programming
when you don't do any data scrubbing
when the learning happens continuously
when you run your computation in one big instance at the beginning

17. You are working with your machine learning algorithm on something called class preditor probability. What algorithm are you most likely using?

multiclass binary classification
naive Bayes
unsupervised classification
decision tree analysis

18. In supervised machine learning, data scientist often have the challenge of balancing between underfitting or overfitting their data model. They often have to adjust the training set to make better predictions. What is this balance called?

the under/over challenge
balance between clustering classification
bias-variance trade-off
the multiclass training set challenge

19. What device below is not an example of Machine Learning?

Google Assistant
Speech to Text
Google Search
None of the above

20. In traditional computer programming, you input commands. What do you input with machine learning?

patterns
programs
rules
data

21. ____ looks at the relationship between predictors and your outcome.

Regression analysis
K-means clustering
Big data
Unsupervised learning

22. To predict a quantity value. use ___.

regression
clustering
classification
dimensionality reduction

23. How do machine learning algorithms make more precise predictions?

The algorithms are typically run more powerful servers.
The algorithms are better at seeing patterns in the data.
Machine learning servers can host larger databases.
The algorithms can run on unstructured data.

24. Your company wants you to build an internal email text prediction model to speed up the time that employees spend writing emails. What should you do?

Include training email data from all employees.
nclude training email data from employees who write the majority of internal emails
Include training email data from new employees.
Include training email data from seasoned employees.

25. Self-organizing maps are specialized neural network for which type of machine learning?

semi-supervised learning
supervised learning
reinforcement learning
unsupervised learning

26. Your data science team wants to use the K-nearest neighbor classification algorithm. Someone on your team wants to use a K of 25. What are the challenges of this approach?

Higher K values will produce noisy data.
Higher K values lower the bias but increase the variance.
Higher K values need a larger training set.
Higher K values lower the variance but increase the bias.

27. Are data model bias and variance a challenge with unsupervised learning?

No, data model bias and variance are only a challenge with reinforcement learning.
Yes, data model bias is a challenge when the machine creates clusters.
Yes, data model variance trains the unsupervised machine learning algorithm.
No, data model bias and variance involve supervised learning.

28. In the HBO show Silicon Valley, one of the characters creates a mobile application called Not Hot Dog. It works by having the user take a photograph of food with their mobile device. Then the app says whether the food is a hot dog. To create the app, the software developer uploaded hundreds of thousands of pictures of hot dogs. How would you describe this type of machine learning?

Reinforcement machine learning
unsupervised machine learning
supervised machine learning
semi-supervised machine learning

29. The security company you work for is thinking about adding machine learning algorithms to their computer network threat detection appliance. What is one advantage of using machine learning?

It could better protect against undiscovered threats.
It would very likely lower the hardware requirements.
It would substantially shorten your development time.
It would increase the speed of the appliance.

30. The supervisor asks to create a machine learning system that will help your hr dep. classify job applicants into well-defined groups.What type of system are more likely to recommend?

deep learning artificial neural network that relies on petabytes of data
unsupervised machine learning system that clusters together the best candidates
Not recommend machine learning for this project
supervised machine learning system that classifies applicants into existing groups

31. Your supervisor asks you to create a machine learning system that will help your human resources department classify jobs applicants into well-defined groups. What type of system are you more likely to recommend?

an unsupervised machine learning system that clusters together the best candidates.
you would not recommend a machine learning system for this type of project.
a deep learning artificial neural network that relies on petabytes of employment data.
a supervised machine learning system that classifies applicants into existing groups.

32. Which of the following is NOT supervised learning?

Decision Tree
Linear Regression
PCA
Naive Bayesian

33. How would you describe this type of classification challenge?

This is a multiclass classification challenge.
This is a multi-binary classification challenge.
This is a binary classification challenge.
This is a reinforcement classification challenge.

34. You work for a website that helps match people up for lunch dates. The website boasts that it uses more than 500 predictors to find customers the perfect date, but many costumers complain that they get very few matches. What is a likely problem with your model?

Your training set is too large.
You are underfitting the model to the data.
You are overfitting the model to the data.
Your machine is creating inaccurate clusters.

35. Which of the following methods can use either as an unsupervised learning or as a dimensionality reduction technique?

TSNE
SVM
PCA
LDA

72. You create a decision tree to show whether someone decides to go to the beach. There are three factors in this decision: rainy, overcast, and sunny. What are these three factors called?

tree nodes
predictors
root nodes
deciders

76. You need to select a machine learning process to run a distributed neural network on a mobile application. Which would you choose?

Scikit-learn
PyTorch
Tensowflow Lite
Tensorflow

81. What is Q-learning reinforcement learning?

supervised machine learning with rewards
a type of unsupervised learning that relies heavily on a well-established model
a type of reinforcement learning where accuracy degrades over time
a type of reinforcement learning that focuses on rewards

84. In the 1983 movie WarGames, the computer learns how to master the game of chess by playing against itself. What machine learning method was the computer using?

binary learning
supervised learning
unsupervised learning
reinforcement learning

88. What is the difference between unstructured and structured data?

Unstructured data is always text.
Unstructured data is much easier to store.
Structured data has clearly defined data types.
Sturctured data is much more popular.

92. Naive Bayes looks at each _ predictor and creates a probability that belongs in each class.

conditional
multiclass
independent
binary

91. What is conditional probability?

the probability that doing one thing has an impact on another thing
the probability that certain conditions are met
the probability that, based on certain conditions, something will always be incorrect
the probability of something being the correct answer

86. What is one of the most effective way to correct for underfitting your model to the data?

Create training clusters
Remove predictors
Use reinforcement learning
Add more predictors

82. The data in your model has low bias and low variance. How would you expect the data points to be grouped together on the diagram?

They would be grouped tightly together in the predicted outcome.
They would be grouped tightly together but far from the predicted.
They would be scattered around the predict outcome.
They would be scattered far away from the predicted outcome.

78. In statistics, what is defined as the probability of a hypothesis test of finding an effect - if there is an effect to be found?

confidence
alpha
power
significance

73. You need to quickly label thousands of images to train a model. What should you do?

Set up a cluster of machines to label the images
Create a subset of the images and label then yourself
Use naive Bayes to automatically generate labels.
Hire people to manually label the images

67. The new dataset you have just scraped seems to exhibit lots of missing values. What action will help you minimizing that problem?

Wise fill-in of controlled random values
Replace missing values with averaging across all samples
Remove defective samples
Imputation

62. What does it mean to underfit your data model?

There is too little data in your training set.
There is too much data in your training set.
There is not a lot of variance but there is a high bias.
Your model has low bias but high variance.

58. The error function most suited for gradient descent using logistic regression is

The entropy function.
The squared error.
The cross-entropy function.
The number of mistakes

54. Your data science team is working on a machine learning product that can act as an artificial opponent in video games. The team is using a machine learning algorithm that focuses on rewards: If the machine does some things well, then it improves the quality of the outcome. How would you describe this type of machine learning algorithm?

semi-supervised machine learning
supervised machine learning
unsupervised machine learning
reinforcement learning

49. Someone of your data science team recommends that you use decision trees, naive Bayes and K-nearest neighbor, all at the same time, on the same training data, and then average the results. What is this an example of?

regression analysis
unsupervised learning
high -variance modeling
ensemble modeling

46. Many of the advances in machine learning have come from improved ___.

statistics
structured data
availability
algorithms

would you describe this transition to different machine learning approaches?

The system went from supervised learning to reinforcement learning.
The system evolved from supervised learning to unsupervised learning.
The system evolved from unsupervised learnin9 to supervised learning.
The system evolved from reinforcement learning to unsupervised learning

39. Why is it important for machine learning algorithms to have access to high-quality data?

It will take too long for programmers to scrub poor data.
If the data is high quality, the algorithms will be easier to develop.
Low-quality data requires much more processing power than high-quality data.
If the data is low quality, you will get inaccurate results.

33. Your machine learning system is attempting to describe a hidden structure from unlabeled data. How would you describe this machine learning method?

supervised learning
unsupervised learning
reinforcement learning
semi-unsupervised learning

31. Your data science team must build a binary classifier, and the number one criterion is the fastest possible scoring at deployment. It may even be deployed in real time. Which technique will produce a model that will likely be fastest for the deployment team use to new cases?

random forest
logistic regression
KNN
deep neural network

26. What is this diagram a good example of?

K-nearest neighbor
a decision tree
a linear regression
a K-means cluster

23. You are working on a project that involves clustering together images of different dogs. You take image and identify it as your centroid image. What type machine learning algorithm are you using?

centroid reinforcement
K-nearest neighbor
binary classification
K-means clustering

19. What is one reason not to use the same data for both your training set and your testing set?

You will almost certainly underfit the model.
You will pick the wrong algorithm.
You might not have enough data for both.
You will almost certainly overfit the model.

21. What is stacking?

The predictions of one model become the inputs another.
You use different versions of machine learning algorithms.
You use several machine learning algorithms to boost your results.
You stack your training set and testing set together.

13. Why is naive Bayes called naive?

It naively assumes that you will have no data.
It does not even try to create accurate predictions.
It naively assumes that the predictors are independent from one another.
It naively assumes that all the predictors depend on one another.

14. You work for an ice cream shop and created the chart below, which shows the relationship between the outside temperature and ice cream sales. What is the best description of this chart?

It is a linear regression chart.
It is a supervised trendline chart.
It is a decision tree.
It is a clustering trend chart.

17. You work for an insurance company. Which machine learning project would add the most value for the company?

Create an artificial neural network that would host the company directory.
Use machine learning to better predict risk.
Create an algorithm that consolidates all of your Excel spreadsheets into one data lake.
Use machine learning and big data to research salary requirements.

11. You work for a power company that owns hundreds of thousands of electric meters. These meters are connected to the internet and transmit energy usage data in real-time. Your supervisor asks you to direct project to use machine learning to analyze this usage data. Why are machine learning algorithms ideal in this scenario?

The algorithms would help the meters access the internet.
The algorithms will improve the wireless connectivity.
The algorithms would help your organization see patterns of the data.
By using machine learning algorithms, you are creating an IoT device.

18. What is the missing information in this diagram?

Training Set
Unsupervised Data
Supervised Learning
Binary Classification

22. You want to create a supervised machine learning system that identifies pictures of kittens on social media. To do this, you have collected more than 100,000 images of kittens. What is this collection of images called?

training data
linear regression
big data
test data

7. You work in a data science team that wants to improve the accuracy of its K-nearest neighbor result by running on top of a naive Bayes result. What is this an example of?

regression
boosting
bagging
stacking

9. What is an example of a commercial application for a machine learning system?

a product recommendation system
a data entry system
a data warehouse system
a massive data repository

27. Random forest is modified and improved version of which earlier technique?

aggregated trees
boosted trees
bagged trees
stacked trees

29. Which statement about K-means clustering is true?

In K-means clustering, the initial centroids are sometimes randomly selected.
K-means clustering is often used in supervised machine learning.
The number of clusters are always randomly selected.
To be accurate, you want your centroids outside of the cluster.

34. You work for a large credit card processing company that wants to create targeted promotions for its customers. The data science team created a machine learning system that groups together customers who made similar purchases, and divides those customers based on customer loyalty. How would you describe this machine learning approach?

It uses unsupervised learning to cluster together transactions and unsupervised learning to classify the customers.
It uses only unsupervised machine learning.
It uses supervised learning to create clusters and unsupervised learning for classification.
It uses reinforcement learning to classify the customers.

37. Which choice is best for binary classification?

K-means
Logistic regression
Linear regression
Principal Component Analysis (PCA)

38. With traditional programming, the programmer typically inputs commands. With machine learning, the programmer inputs?

supervised learning
data
unsupervised learning
algorithms

87.Your data science team is often criticized for creating reports that are boring or too obvious. What could you do to help improve the team?

Suggest that the team is probably underfitting the model to the data.
Suggest that unsupervised learning will lead to more interesting results.
Make sure that they are picking the correct machine learning algorithms.
Encourage the team to ask more interesting questions.

89. You work for a startup that is trying to develop a software tool that will scan the internet for pictures of people using specific tools. The chief executive is very interested in using machine learning algorithms. What would you recommend as the best place to start?

Using an unsupervised machine learning algorithm to cluster together all the photographs.
Crate a data lake with an unsupervised machine learning algorithm.
Use a combination of unsupervised and supervised machine learning to create machine-defined data clusters.
Use supervised machine learning to classify photographs based on a predetermined training set.

3. You work for a music streaming service and want to use supervised machine learning to classify music into different genres. Your service has collected thousands of songs in each genre, and you used this as your training data. Now you pull out a small random subset of all the songs in your service. What is this subset called?

data cluster
Supervised set
big data
test data

6. You want to identify global weather patterns that may have been affected by climate change. To do so, you want to use machine learning algorithms to find patterns that would otherwise be imperceptible to a human meteorologist. What is the place to start?

Find labeled data of sunny days so that the machine will learn to identify bad weather.
Use unsupervised learning have the machine look for anomalies in a massive weather database.
Create a training set of unusual patterns and ask the machine learning algorithms to classify them.
Create a training set of normal weather and have the machine look for similar patterns.

42. You work for a large pharmaceutical company whose data science team wants to use unsupervised learning machine algorithms to help discover new drugs. What is an advantage to this approach?

You will be able to prioritize different classes of drugs, such as antibiotics.
You can create a training set of drugs you would like to discover.
The algorithms will cluster together drugs that have similar traits.
Human experts can create classes of drugs to help guide discovery.

47. What is this diagram a good example of?

unsupervised learning
complex cluster
multiclass classification
k-nearest neighbour

51. You work for a website that enables customers see all images of themselves on the internet by uploading one self-photo. Your data model uses 5 characteristics to match people to their foto: color, eye, gender, eyeglasses and facial hair. Your customers have been complaining that get tens of thousands of fotos without them. What is the problem?

You are overfitting the model to the data
You need a smaller training set
You are underfitting the model to the data
You need a larger training set

53. You and your data science team have 1 TB of example data. What do you typically do with that data?

you use it as your training set.
You label it big data.
You split it into a training set and test set.
You use it as your test set.

57. Suppose we would like to perform clustering on spatial data such as the geometrical locations of houses. We wish to produce clusters of many different sizes and shapes. Which of the following methods is the most appropriate?

Decision Trees
K-means clustering
Density-based clustering
Model-based clustering

69. What is the main motivation for using activation functions in ANN?

Capturing complex non-linear patterns
Transforming continuous values into "ON" (1) or "OFF" (0) values
Help avoiding the vanishing/exploding gradient problem
Their ability to activate each neurons individually.

71. What is the correct option?

No. Red Blue Green

1. Validation error Training error Test error

2. Training error Test error Validation error

3. Optimal error Validation error Test error

4. Validation error Training error Optimal error

1. You are part of data science team that is working for a national fast-food chain. You create a simple report that shows trend: Customers who visit the store more often and buy smaller meals spend more than customers who visit less frequently and buy larger meals. What is the most likely diagram that your team created?

multiclass classification diagram
linear regression and scatter plots
pivot table
K-means cluster diagram

59. Compared to the variance of the Maximum Likelihood Estimate (MLE), the variance of the Maximum A Posteriori (MAP) estimate is ___

Higher
same
Lower
it could be any of the above

63. Asian user complains that your company's facial recognition model does not properly identify their facial expressions. What should you do?

Include Asian faces in your test data and retrain your model.
Retrain your model with updated hyperparameter values.
Retrain your model with smaller batch sizes.
Include Asian faces in your training data and retrain your model.

2. You work for an organization that sells a spam filtering service to large companies. Your organization wants to transition its product to use machine learning. It currently a list Of 250,00 keywords. If a message contains more than few of these keywords, then it is identified as spam. What would be one advantage of transitioning to machine learning?

The product would look for new patterns in spam messages.
The product could go through the keyword list much more quickly.
The product could have a much longer keyword list.
The product could find spam messages using far fewer keywords.

66. The activations for class A, B and C before softmax were 10,8 and 3. The different in softmax values for class A and class B would be :

76%
88%
12%
0.0008%

79. You want to create a machine learning algorithm to identify food recipes on the web. To do this, you create an algorithm that looks at different conditional probabilities. So if the post includes the word flour, it has a slightly stronger probability of being a recipe. If it contains both flour and sugar, it even more likely a recipe. What type of algorithm are you using?

naive Bayes classifier
K-nearest neighbor
multiclass classification
decision tree

83. Your machine learning system is using labeled examples to try to predict future data, compare that data to the predicted result, and then the model. What is the best description of this machine learning method?