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NEW QUESTION 51
A data engineer at a bank is evaluating a new tabular dataset that includes customer dat a. The data engineer will use the customer data to create a new model to predict customer behavior. After creating a correlation matrix for the variables, the data engineer notices that many of the 100 features are highly correlated with each other.
Which steps should the data engineer take to address this issue? (Choose two.)

A. Use a linear-based algorithm to train the model.B. Apply min-max feature scaling to the dataset.C. Remove a portion of highly correlated features from the dataset.D. Apply one-hot encoding category-based variables.E. Apply principal component analysis (PCA).

Answer: B,E

Explanation:
Reference:
https://scikit-learn.org/stable/auto_examples/preprocessing/plot_all_scaling.html

 

NEW QUESTION 52
A Data Science team is designing a dataset repository where it will store a large amount of training data commonly used in its machine learning models. As Data Scientists may create an arbitrary number of new datasets every day the solution has to scale automatically and be cost-effective. Also, it must be possible to explore the data using SQL.
Which storage scheme is MOST adapted to this scenario?

A. Store datasets as files in Amazon S3.B. Store datasets as tables in a multi-node Amazon Redshift cluster.C. Store datasets as files in an Amazon EBS volume attached to an Amazon EC2 instance.D. Store datasets as global tables in Amazon DynamoDB.

Answer: B

 

NEW QUESTION 53
A Data Scientist is developing a machine learning model to classify whether a financial transaction is fraudulent. The labeled data available for training consists of 100,000 non-fraudulent observations and 1,000 fraudulent observations.
The Data Scientist applies the XGBoost algorithm to the data, resulting in the following confusion matrix when the trained model is applied to a previously unseen validation dataset. The accuracy of the model is 99.1%, but the Data Scientist has been asked to reduce the number of false negatives.

Which combination of steps should the Data Scientist take to reduce the number of false positive predictions by the model? (Choose two.)

A. Increase the XGBoost scale_pos_weight parameter to adjust the balance of positive and negative weights.B. Decrease the XGBoost max_depth parameter because the model is currently overfitting the data.C. Increase the XGBoost max_depth parameter because the model is currently underfitting the data.D. Change the XGBoost eval_metric parameter to optimize based on rmse instead of error.E. Change the XGBoost eval_metric parameter to optimize based on AUC instead of error.

Answer: B,E

 

NEW QUESTION 54
A Machine Learning Specialist at a company sensitive to security is preparing a dataset for model training. The dataset is stored in Amazon S3 and contains Personally Identifiable Information (PII).
The dataset:
* Must be accessible from a VPC only.
* Must not traverse the public internet.
How can these requirements be satisfied?

A. Create a VPC endpoint and use Network Access Control Lists (NACLs) to allow traffic between only the given VPC endpoint and an Amazon EC2 instance.B. Create a VPC endpoint and apply a bucket access policy that restricts access to the given VPC endpoint and the VPC.C. Create a VPC endpoint and use security groups to restrict access to the given VPC endpoint and an Amazon EC2 instanceD. Create a VPC endpoint and apply a bucket access policy that allows access from the given VPC endpoint and an Amazon EC2 instance.

Answer: D

Explanation:
Explanation/Reference: https://docs.aws.amazon.com/AmazonS3/latest/dev/example-bucket-policies-vpc-endpoint.html

 

NEW QUESTION 55
A large mobile network operating company is building a machine learning model to predict customers who are likely to unsubscribe from the service. The company plans to offer an incentive for these customers as the cost of churn is far greater than the cost of the incentive.
The model produces the following confusion matrix after evaluating on a test dataset of 100 customers:
Based on the model evaluation results, why is this a viable model for production?

A. The precision of the model is 86%, which is greater than the accuracy of the model.B. The model is 86% accurate and the cost incurred by the company as a result of false positives is less than the false negatives.C. The precision of the model is 86%, which is less than the accuracy of the model.D. The model is 86% accurate and the cost incurred by the company as a result of false negatives is less than the false positives.

Answer: D

 

NEW QUESTION 56
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