⚡ Normality check (Shapiro-Wilk) in 4 steps

A quick recipe on the practice survey dataset. Press the button to load the data and run it, or follow the steps yourself after File → Sample dataset.

Load the data and run it

What are the steps?

1. Analyze → Descriptive Statistics → Explore…
2. Dependent list: score.
3. Factor: group.
4. Press OK and read “Tests of Normality” and the boxplot.

What result should I see?

Control: W(72) = .973, p = .128
Programme A: W(45) = .969, p = .260
Programme B: W(33) = .932, p = .040

How to read every number: guide page. Worked through on a full study: Exam scores under three teaching methods, Blood pressure before and after a lifestyle programme, Quality control on three bottling lines.