Question 526 of 1,672
MLS-C01 Exploratory Data Analysis Practice Question
In exploratory data analysis, a data scientist notices that the distribution of a continuous variable is bimodal. The scientist suspects that the two modes correspond to two different groups in the data. Which visualization is MOST appropriate to confirm this suspicion?
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
✓
Histogram with overlaid densities by group
The most appropriate because a histogram with overlaid densities, colored by group, directly shows the distribution of each group and can reveal whether the two modes correspond to different groups. Option A (box plot) displays summary statistics but not the shape or modality. Option B (bar chart) is for categorical data, not continuous. Option D (scatter plot) is for two continuous variables, not for examining a single distribution.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Box plot
Why it's wrong here
A box plot shows median and quartiles but not bimodality.
- ✗
Bar chart
Why it's wrong here
Bar charts are for categorical data.
- ✓
Histogram with overlaid densities by group
Why this is correct
Overlaying densities by group allows visual comparison of the two modes.
- ✗
Scatter plot
Why it's wrong here
A scatter plot is used for two continuous variables.
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Last reviewed: Jun 20, 2026
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