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Amazon MLS-C01  Exam Questions & Answers
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Amazon MLS-C01 Exam Questions & Answers


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  • Vendor: Amazon

    Exam Code: MLS-C01

    Exam Name: AWS Certified Machine Learning - Specialty (MLS-C01)

    Certification Provider: Amazon

    Total Questions: 394 Q&A ( View Details)

    Updated on: Jun 11, 2025

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MLS-C01 Online Practice Questions and Answers

Questions 1

A retail chain has been ingesting purchasing records from its network of 20,000 stores to Amazon S3 using Amazon Kinesis Data Firehose To support training an improved machine learning model, training records will require new but simple transformations, and some attributes will be combined The model needs lo be retrained daily

Given the large number of stores and the legacy data ingestion, which change will require the LEAST amount of development effort?

A. Require that the stores to switch to capturing their data locally on AWS Storage Gateway for loading into Amazon S3 then use AWS Glue to do the transformation

B. Deploy an Amazon EMR cluster running Apache Spark with the transformation logic, and have the cluster run each day on the accumulating records in Amazon S3, outputting new/transformed records to Amazon S3

C. Spin up a fleet of Amazon EC2 instances with the transformation logic, have them transform the data records accumulating on Amazon S3, and output the transformed records to Amazon S3.

D. Insert an Amazon Kinesis Data Analytics stream downstream of the Kinesis Data Firehouse stream that transforms raw record attributes into simple transformed values using SQL.

Show Answer

Correct Answer: D

https://docs.aws.amazon.com/kinesisanalytics/latest/java/examples-s3.html

Questions 2

A Machine Learning Specialist is working with a large company to leverage machine learning within its products. The company wants to group its customers into categories based on which customers will and will not churn within the next 6 months. The company has labeled the data available to the Specialist.

Which machine learning model type should the Specialist use to accomplish this task?

A. Linear regression

B. Classification

C. Clustering

D. Reinforcement learning

Show Answer

Correct Answer: B

The goal of classification is to determine to which class or category a data point (customer in our case) belongs to. For classification problems, data scientists would use historical data with predefined target variables AKA labels (churner/nonchurner) ?answers that need to be predicted ?to train an algorithm. With classification, businesses can answer the following questions:

1.

Will this customer churn or not?

2.

Will a customer renew their subscription?

3.

Will a user downgrade a pricing plan?

4.

Are there any signs of unusual customer behavior?

Reference: https://www.kdnuggets.com/2019/05/churn-prediction-machine-learning.html

Questions 3

A financial company is trying to detect credit card fraud. The company observed that, on average, 2% of credit card transactions were fraudulent. A data scientist trained a classifier on a year's worth of credit card transactions data. The model needs to identify the fraudulent transactions (positives) from the regular ones (negatives). The company's goal is to accurately capture as many positives as possible.

Which metrics should the data scientist use to optimize the model? (Choose two.)

A. Specificity

B. False positive rate

C. Accuracy

D. Area under the precision-recall curve

E. True positive rate

Show Answer More Questions

Correct Answer: DE

The goal is to accurately capture as many fraudulent transactions (positives) as possible. To optimize the model towards this goal, the data scientist should focus on metrics that emphasize the true positive rate and the area under the precision-recall curve.

True positive rate (TPR or sensitivity) is the proportion of actual positive cases that are correctly identified as positive by the model. A higher TPR means that more fraudulent transactions are being captured.

The precision-recall curve is a graph that shows the trade-off between precision and recall for different thresholds

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