The Shapiro-Wilk test examines if a variable is normally distributed in a population. This assumption is required by some statistical tests such as t-tests and ANOVA.
The SW-test is an alternative for the Kolmogorov-Smirnov test. This tutorial shows how to run and interpret it in SPSS.
A binomial test examines if a population percentage is equal to x.
Example: is 45% of all Amsterdam citizens currently single? Or is it a different percentage?
This simple tutorial quickly walks you through the basics.
This tutorial walks you through running and interpreting a binomial test in SPSS.
With step-by-step example on downloadable practice data file.
A z-test for 2 independent proportions examines if some event occurs equally often in 2 subpopulations.
Example: do equal percentages of male and female students answer some exam question correctly?
This tutorial covers examples, assumptions and formulas and presents a simple Excel tool for running z-tests the easy way.
SPSS Friedman test compares the means of 3 or more variables measured on the same respondents. Like so, it is a nonparametric alternative for a repeated-measures ANOVA that's used when the latter’s assumptions aren't met.