Testing for Normality in SPSS Click the picture and download the data file

The Shapiro-Wilk Normality Test The Shapiro-Wilk test is a popular normality test. Its hypotheses are as follows, given α = 0.05:  Null Hypothesis: The data is normally distributed.  Alternative Hypothesis: The data is not normally distributed. Rejecting the null hypothesis infers the data is nonnormal and should use nonparametric statistics for your anaysis.

The Test of Normality Step 1: Open the SPSS SAV file and select Analysis->Descriptive Statistics->Explore…

Step 2: Place Data into the Dependent List and click Plots…

Step 3: Uncheck the boxes except for Normality plots with tests. Click Continue.

Step 4: Read the result!

The Q-Q plot sure looks like a normal distribution! The Shapiro-Wilk test fails to reject the null hypothesis and we state our data is normal.

Testing Normality in SPSS.pdf

... the Dependent List and click Plots... Step 3: Uncheck the boxes except for Normality plots with tests. Click Continue. Step 4: Read the result! The Q-Q plot sure ...

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