Statistics · Module 9 · Comparing two groups

Comparing Two Groups Walkthrough

Watch two clinics, before-and-after patients and an A/B test turn into differences, standard errors, t and z statistics, p-values and intervals. Learn when data are independent or paired, and how to say what the result means in context. Go at your own pace. Nothing here is graded.

Speed

Think of it like this

Quick check

Wrong answers are fine here. Read why, then try again.

Dr. Akash Garg · Statistics Study Tools · CC BY-NC-SA 4.0
Use the left and right arrow keys to move between steps. Practice next in the Comparing Two Groups Lab. Every data set here uses made-up practice numbers chosen to look realistic; they are not clinical reference values. t-curve areas and critical values come from an accurate Student t CDF (any degrees of freedom, including the Welch df), checked against standard statistical software.