Certificate in Business Data Analytics (CBDA) — Question 62

A new dataset describing employee salaries is received by a company. A colleague wonders whether a variable follows a Gaussian distribution.
Which of the following plots would demonstrate this?

Answer options

• A. Scatterplot
• B. Normal probability plot
• C. Boxplot
• D. Lowess curve

Correct answer: B

Explanation

The Normal probability plot is specifically designed to assess if a dataset follows a Gaussian distribution by plotting the observed values against the expected values under normality. The other options, such as scatterplots, boxplots, and Lowess curves, do not provide a direct method for evaluating normality.