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- Rather work it out yourself? Try the test chooser below.
Interactive guide
Which statistical test should I use?
Answer a few plain-language questions. You'll get a suggested test, what to check before you trust it, and links to free tools.
A starting point, not a substitute for looking at your data. Design details such as clustering, missing data, and multiple comparisons can change the right answer.
Free resources
Free tools and guides
These live on the DASS site and are free to use.
Tools
Power analysis calculators
Plan sample size for t-tests, ANOVA, correlations, chi-square, and multilevel designs.
Open calculators →APA 7 results formatters
Turn statistical output into clean, copy-ready APA sentences. Runs in your browser.
Open formatters →Check a reported p-value
Recompute the exact p from a t, F, chi-square, or correlation statistic and compare it to what was reported.
Check a p-value →Guides
Answers
Recent questions, answered
Plain-language answers to statistics questions people are asking.
What does a normal Q-Q plot's shape actually tell you?
A normal Q-Q plot compares your data to a normal distribution. The shape of the departure from the line tells you what kind of departure you have.
Read the answer →How do you normalize data to a 0-1 range?
Min-max scaling rescales any set of numbers so the smallest value becomes 0 and the largest becomes 1, using one formula.
Read the answer →Interrupted time series vs event study vs difference-in-differences
All three estimate the effect of an intervention, but each builds its counterfactual differently. Here is how to tell them apart.
Read the answer →Need more than an answer?
AskStats is run by DASS. If your question turns into a project (study design, data analysis and visualization, or training for your team), book a free 30-minute strategy call.