Hypothesis Tests

Could it be chance?

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Assume the null hypothesis, then ask how surprising the data are.
• p-value: the probability of results at least this extreme if H₀ is true.
• A small p is evidence against H₀, but it is not the probability that H₀ is true.

Steps

1. Innocent until proven guilty
2. Compute a p-value
3. Significance
4. Two-sided
5. Power
6. What p means