Which of the following is true when testing for normality of errors?
A) Normality is verified by inspecting for a bell-shaped distribution.
B) It is easier to evaluate normality with small sample sizes.
C) A scatter diagram of the whole data is always used to verify normality.
D) Errors are normally distributed when the scatter diagram shows a straight-line distribution.

Question

Quizplus · Accepted Answer

Normality is verified by inspecting for a bell-shaped distribution. This can be done through histograms, Q-Q plots, or statistical tests such as the Shapiro-Wilk test. It is not necessarily easier to evaluate normality with small sample sizes, and a scatter diagram is not always used for this purpose. Additionally, a straight-line distribution in a scatterplot does not necessarily indicate normality.

Which of the Following Is True When Testing for Normality