RESEARCH TOOLKIT · FREE
Statistical test picker
Answer a few questions about your data and see which test to use, the alternative if your data aren't normal, and what to report in your results.
1. What is the analysis for?
Answer the questions to see the test.
Is my data normal?
Look at a histogram and a Q–Q plot, and use the Shapiro–Wilk test (for samples under about 50). If the mean and median are far apart, or the SD is larger than half the mean for a value that can’t go below zero, treat it as skewed.
Need the sample size first? Sample size calculator
Free to use. Everything you enter stays in your browser; nothing is sent to us. Results are a guide — check them with your guide or statistician before you rely on them.
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