QUESTION: 41

A Machine Learning Specialist is building a prediction model for a large number of features using linear models, such as linear regression and logistic regression. During exploratory data analysis, the Specialist observes that many features are highly correlated with each other. This may make the model unstable.

What should be done to reduce the impact of having such a large number of features?

Perform one-hot encoding on highly correlated features.
Use matrix multiplication on highly correlated features.
Create a new feature space using principal component analysis (PCA)
Apply the Pearson correlation coefficient.

Answer(s): C

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QUESTION: 42

A Machine Learning Specialist is implementing a full Bayesian network on a dataset that describes public transit in New York City. One of the random variables is discrete, and represents the number of minutes New Yorkers wait for a bus given that the buses cycle every 10 minutes, with a mean of 3 minutes.

Which prior probability distribution should the ML Specialist use for this variable?

Poisson distribution
Uniform distribution
Normal distribution
Binomial distribution

Answer(s): A

Explanation:

If you have information about the average (mean) number of things that happen in some given time period / interval, Poisson distribution can give you a way to predict the odds of getting some other value on a given future day

Reference:

https://brilliant.org/wiki/poisson-distribution/

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QUESTION: 43

A Data Science team within a large company uses Amazon SageMaker notebooks to access data stored in Amazon S3 buckets. The IT Security team is concerned that internet-enabled notebook instances create a security vulnerability where malicious code running on the instances could compromise data privacy. The company mandates that all instances stay within a secured VPC with no internet access, and data communication traffic must stay within the AWS network.

How should the Data Science team configure the notebook instance placement to meet these requirements?

Associate the Amazon SageMaker notebook with a private subnet in a VPC. Place the Amazon SageMaker endpoint and S3 buckets within the same VPC.
Associate the Amazon SageMaker notebook with a private subnet in a VPC. Use IAM policies to grant access to Amazon S3 and Amazon SageMaker.
Associate the Amazon SageMaker notebook with a private subnet in a VP Ensure the VPC has S3 VPC endpoints and Amazon SageMaker VPC endpoints attached to it.
Associate the Amazon SageMaker notebook with a private subnet in a VPC. Ensure the VPC has a NAT gateway and an associated security group allowing only outbound connections to Amazon S3 and Amazon SageMaker.

Answer(s): C

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QUESTION: 44

A Machine Learning Specialist has created a deep learning neural network model that performs well on the training data but performs poorly on the test data.

Which of the following methods should the Specialist consider using to correct this? (Choose three.)

Decrease regularization.
Increase regularization.
Increase dropout.
Decrease dropout.
Increase feature combinations.
Decrease feature combinations.

Answer(s): B,C,F

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QUESTION: 41

QUESTION: 42

Explanation:

Reference:

QUESTION: 43

QUESTION: 44