Quick Answer
The correct choice is a histogram with a logarithmic scale on the x-axis. This visualization is most appropriate for a heavily right-skewed distribution because applying a log scale compresses the long tail and expands the dense lower values, effectively transforming the skewed shape into a more interpretable, often near-normal distribution. On the AWS Certified Machine Learning Specialty MLS-C01 exam, this question tests your understanding of data exploration techniques, specifically how to handle skewed features before modeling—a common real-world scenario in regression or anomaly detection tasks. A frequent trap is choosing a box plot, but while it shows quartiles and outliers, it obscures the underlying density and modality of the distribution. A scatter plot is for bivariate relationships, and a line chart is reserved for time series. Memory tip: when you see a long tail, think “log the tail”—logarithmic scaling tames skewness and reveals the true shape of your data.
This MLS-C01 practice question tests your understanding of exploratory data analysis. Compare every option against the stated constraints before choosing — the best answer satisfies all requirements, not just the most obvious one. 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 reviewing a dataset and notices that the distribution of a numerical feature is heavily right-skewed with a long tail. Which visualization is most appropriate to assess the distribution?
Box plot
Why wrong: Box plot shows summary statistics but not the detailed distribution shape.
Line chart
Why wrong: Line chart is typically for time series data.
Scatter plot
Why wrong: Scatter plot shows relationship between two variables.
Histogram with a logarithmic scale on the x-axis
Log scale helps visualize skewed distributions.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Histogram with a logarithmic scale on the x-axis
Option B is correct because a histogram with a log scale can handle skewed data. Option A is wrong because a box plot shows quartiles but not the full distribution shape. Option C is wrong because a scatter plot is for two variables. Option D is wrong because a line chart is for time series.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
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
Box plot shows summary statistics but not the detailed distribution shape.
Line chart
Why it's wrong here
Line chart is typically for time series data.
Scatter plot
Why it's wrong here
Scatter plot shows relationship between two variables.
Histogram with a logarithmic scale on the x-axis
Why this is correct
Log scale helps visualize skewed distributions.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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
Box plot shows summary statistics but not the detailed distribution shape.
Detailed technical explanation
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
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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FAQ
Exploratory Data Analysis — This question tests Exploratory Data Analysis — Read the scenario before looking for a memorised answer..
The correct answer is: Histogram with a logarithmic scale on the x-axis — Option B is correct because a histogram with a log scale can handle skewed data. Option A is wrong because a box plot shows quartiles but not the full distribution shape. Option C is wrong because a scatter plot is for two variables. Option D is wrong because a line chart is for time series.
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.
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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