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Question 123 - CBDA discussion

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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?

A.
Normal probability plot
Answers
A.
Normal probability plot
B.
Scatterplot
Answers
B.
Scatterplot
C.
Boxplot
Answers
C.
Boxplot
D.
Lowess curve
Answers
D.
Lowess curve
Suggested answer: A

Explanation:

A normal probability plot is a graphical technique that can be used to check if a variable follows a Gaussian distribution. It plots the observed values of the variable against the expected values under the normal distribution. If the variable is normally distributed, the points should form a straight line. A scatterplot, a boxplot, and a lowess curve are not suitable for testing normality, as they do not compare the observed values with the theoretical values of the normal distribution.

https://www.graphpad.com/support/faq/testing-data-for-normal-distrbution/

asked 18/09/2024
Prinesh Chain
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