Question 1easymultiple choice
Full question →- A
0.727
Why wrong: This is recall, not precision.
- B
0.8
Precision = TP/(TP+FP) = 80/100 = 0.8.
- C
0.75
Why wrong: This is accuracy.
- D
0.762
Why wrong: This is the F1 score.
Question 534 of 1,755
Quick Answer
The answer is 0.8. This is correct because precision measures the proportion of positive identifications that were actually correct, calculated as true positives divided by the sum of true positives and false positives, or TP/(TP+FP). With TP=80 and FP=20, the calculation is 80/(80+20)=80/100=0.8. On the AWS Certified Machine Learning Specialty MLS-C01 exam, you will frequently need to calculate precision from a confusion matrix to evaluate classifier performance, especially in imbalanced datasets where accuracy can be misleading. A common trap is confusing precision with recall—precision focuses on false positives (Type I errors), while recall focuses on false negatives (Type II errors). A helpful memory tip: think of precision as “how precise your positive predictions are”—if you predict positive, precision tells you how often you are right.
MLS-C01 Modeling Practice Question
This MLS-C01 practice question tests your understanding of modeling. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A data scientist is building a binary classifier and obtains the following confusion matrix on the test set: TP=80, FP=20, TN=70, FN=30. What is the precision?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
0.8
Precision = TP / (TP+FP) = 80/(80+20)=0.8. Recall = TP/(TP+FN)=80/110≈0.727. Accuracy = (80+70)/200=0.75. F1 = 2*(0.8*0.727)/(0.8+0.727)≈0.762.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
0.727
Why it's wrong here
This is recall, not precision.
- ✓
0.8
Why this is correct
Precision = TP/(TP+FP) = 80/100 = 0.8.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
0.75
Why it's wrong here
This is accuracy.
- ✗
0.762
Why it's wrong here
This is the F1 score.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Identify which MLS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Modeling — study guide chapter
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FAQ
Questions learners often ask
What does this MLS-C01 question test?
Modeling — This question tests Modeling — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: 0.8 — Precision = TP / (TP+FP) = 80/(80+20)=0.8. Recall = TP/(TP+FN)=80/110≈0.727. Accuracy = (80+70)/200=0.75. F1 = 2*(0.8*0.727)/(0.8+0.727)≈0.762.
What should I do if I get this MLS-C01 question wrong?
Identify which MLS-C01 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 2026
This MLS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the MLS-C01 exam.
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