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Amazon MLS-C01

AWS Certified Machine Learning - Specialty

Verified practice questions with detailed answers, clear explanations, and community discussion.

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Question 1 of 369

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:Exam AWS Certified Machine Learning - Specialty: Question 1 - Image 1

Based on the model evaluation results, why is this a viable model for production?

Answer choices
Show answer

Correct answer: C

The model is evaluated based on its ability to minimize the potential loss from customer churn. The cost of churn (losing a customer) is far greater than the cost of giving an incentive (to a customer who is predicted to churn but does not actually churn). Therefore, it is vital to reduce the number of false negatives, which represent customers who are incorrectly predicted not to churn but actually do churn. In this scenario, the confusion matrix shows 10 false positives (customers incorrectly predicted to churn) and 4 false negatives (customers incorrectly predicted not to churn). This results in higher false positives, which are less costly as per the given context. Hence, the correct justification is that the cost incurred by the company as a result of false positives is less than the false negatives.

Community votes

131 votes

CSuggested

69%

A

31%

Question 2 of 369

A Machine Learning Specialist is designing a system for improving sales for a company. The objective is to use the large amount of information the company has on users' behavior and product preferences to predict which products users would like based on the users' similarity to other users.

What should the Specialist do to meet this objective?

Answer choices
Show answer

Correct answer: B

The objective is to use user behavior and product preferences to predict product recommendations based on user similarity. Collaborative filtering recommendation systems are designed to achieve this by leveraging data on user ratings and preferences to identify similar users and make predictions based on their interactions. Content-based filtering focuses on similarities between items rather than user behavior, model-based filtering is a broader term without specificity, and combinative filtering is not a recognized method. Thus, a collaborative filtering recommendation engine is the appropriate choice for this objective.

Community votes

29 votes

BSuggested

100%

Question 3 of 369

A Mobile Network Operator is building an analytics platform to analyze and optimize a company's operations using Amazon Athena and Amazon S3.

The source systems send data in .CSV format in real time. The Data Engineering team wants to transform the data to the Apache Parquet format before storing it on Amazon S3.

Which solution takes the LEAST effort to implement?

Answer choices
Show answer

Correct answer: D

The solution that takes the least effort to implement is to ingest .CSV data from Amazon Kinesis Data Streams and use Amazon Kinesis Data Firehose to convert the data into Parquet. Amazon Kinesis Data Firehose is a fully managed service that facilitates the automatic transformation and delivery of streaming data to destinations such as Amazon S3, which minimizes the need for additional development and management. While other options involve setting up and maintaining infrastructure as well as developing complex ETL jobs, Kinesis Data Firehose's serverless architecture and built-in capabilities make it the most straightforward and low-effort solution.

Community votes

51 votes

DSuggested

57%

B

43%

Question 4 of 369

A city wants to monitor its air quality to address the consequences of air pollution. A Machine Learning Specialist needs to forecast the air quality in parts per million of contaminates for the next 2 days in the city. As this is a prototype, only daily data from the last year is available.

Which model is MOST likely to provide the best results in Amazon SageMaker?

Answer choices
Show answer

Correct answer: C

To forecast air quality in parts per million of contaminants for the next 2 days with only daily data from the last year, the most suitable model will be the Amazon SageMaker Linear Learner algorithm with a predictor_type of regressor. The reason is that forecasting involves predicting continuous numeric values, which aligns well with regression models. The Linear Learner algorithm is particularly versatile and effective for regression tasks, making it suitable for this time series prediction task. Classifiers and algorithms designed for anomaly detection (such as Random Cut Forest) would not be appropriate as they are not tailored for forecasting. Despite k-Nearest-Neighbors (kNN) being used for regression in some cases, it is generally more suitable for classification tasks and may not perform as well as a dedicated regression algorithm like Linear Learner for time series data with potential linear relationships among the data points.

Community votes

20 votes

CSuggested

80%

A

15%

D

5%

Question 5 of 369

A Data Engineer needs to build a model using a dataset containing customer credit card information

How can the Data Engineer ensure the data remains encrypted and the credit card information is secure?

Answer choices
Show answer

Correct answer: D

Using AWS Key Management Service (KMS) to encrypt the data ensures that the data is protected both in Amazon S3 and Amazon SageMaker. AWS KMS provides a secure and centralized key management system for managing encryption keys. Redacting credit card numbers with AWS Glue ensures that sensitive information is not included in the dataset that the model is trained on. This approach addresses both encryption needs and data privacy concerns effectively.

Community votes

16 votes

DSuggested

100%

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As this was my first certification exam, I was understandably nervous about what to expect. These study materials made the preparation process much easier, and many of the questions closely reflected those on the actual exam.
Charles Sirois
Canada
May 5, 2026
Wasted about a month going through the free dump sites scattered all over reddit, half the answers were wrong and the other half were for a version of the exam that doesn't even exist anymore. Eventually gave in and paid the small fee here, and the difference was night and day.
Lance Chambers
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Apr 11, 2026
Honestly, I had already gone through the official documentation quite thoroughly, but still didn't feel fully confident going in. This helped things finally click for me. I realized I knew the material, but just hadn't connected all the pieces yet.
Alisha Kelly
Italy
Apr 9, 2026
Used this along with Microsoft Learn and the combo worked really well. The practice questions made the stuff I'd read actually stick. Passed first attempt, no complaints from me.
Casper Claassen
Netherlands
Jun 2, 2025
The content is accurate and clearly presented, and it's more affordable than competitors. The team has been incredibly responsive whenever I've had an issue, and they've been open to small changes that improve the platform.
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Italy
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I don't usually leave reviews, but this one felt worth sharing. The questions were quite close to what actually appeared on the exam, more than I expected. I spent about a week going through the material before my test, and it helped me feel more prepared.
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A very quick response was received via email when a link issue occurred. The study materials provided were high quality and extremely helpful. I was able to complete the test successfully. Many thanks for the excellent support.
Neil Savage
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Apr 13, 2026
I don't usually leave reviews, but this one felt worth sharing. The questions were quite close to what actually appeared on the exam, more than I expected. I spent about a week going through the material before my test, and it helped me feel more prepared.
Morgan Farmer
United Kingdom
May 4, 2026
Passed ITIL 4 Foundation with 87%. Material was enough by itself.
Remi Nuyts
United States
Apr 9, 2026
I had a smooth experience from start to finish. Access was available right away, no technical issues, which made it easy to get started. The content felt relevant and aligned well with what I was looking for.
Archie Hopkins
United States
Apr 11, 2026
Does what it says it does. Content felt solid, nothing confusing to navigate and I didn't run into any weird issues. I been putting off scheduling the exam for a while and going through this gave me enough confidence to finally book it and pass.
Nancy Mcbride
United States
May 8, 2026
A very quick response was received via email when a link issue occurred. The study materials provided were high quality and extremely helpful. I was able to complete the test successfully. Many thanks for the excellent support.
Neil Savage
United States

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