The answer is a box plot grouped by target class and a histogram with overlaid target classes. These two visualizations are most useful for understanding the relationship between a numerical feature and a binary target because they directly reveal differences in the feature’s distribution across the two target groups. A box plot shows median, spread, and outliers for each class, while a histogram with overlaid classes highlights shifts in density and overlap. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this question tests your ability to match visualization types to data types—a common trap is choosing a scatter plot (for two numerical variables) or a bar chart (for categorical features). Remember that for a numerical feature versus a binary target, you need to compare distributions, not plot individual points. Memory tip: “Box and histo for binary vs. listo”—use box plots or histograms when your target has just two classes.
MLS-C01 Exploratory Data Analysis Practice Question
This MLS-C01 practice question tests your understanding of exploratory data analysis. 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 analyst is exploring a dataset with a binary target variable. Which TWO visualizations are most useful for understanding the relationship between a numerical feature and the target?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Histogram with overlaid target classes
Options A and D are correct. A: A box plot grouped by target class shows distribution differences. D: A histogram with overlaid target classes shows how the feature distribution differs. Option B is incorrect because a scatter plot is for two numerical variables. Option C is incorrect because a bar chart is for categorical features. Option E is incorrect because a pie chart is for proportions, not relationships.
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.
✗
Pie chart of the feature
Why it's wrong here
Pie chart shows proportions, not relationship with target.
✗
Bar chart of the feature
Why it's wrong here
Bar chart is for categorical features.
✓
Histogram with overlaid target classes
Why this is correct
Shows how the feature distribution differs by class.
Related concept
Read the scenario before looking for a memorised answer.
✓
Box plot grouped by target class
Why this is correct
Shows distribution differences between classes.
Related concept
Read the scenario before looking for a memorised answer.
✗
Scatter plot of the feature versus target
Why it's wrong here
Scatter plot requires both variables to be numerical.
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.
Trap categories for this question
Command / output trap
Pie chart shows proportions, not relationship with target.
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.
Exploratory Data Analysis — This question tests Exploratory Data Analysis — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Histogram with overlaid target classes — Options A and D are correct. A: A box plot grouped by target class shows distribution differences. D: A histogram with overlaid target classes shows how the feature distribution differs. Option B is incorrect because a scatter plot is for two numerical variables. Option C is incorrect because a bar chart is for categorical features. Option E is incorrect because a pie chart is for proportions, not relationships.
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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Question Discussion
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