What is the null hypothesis in this drink-and-reaction-time example?

Conditions

• There are exactly three groups in the displayed example.
• The compared quantity is mean reaction time.

Reasoning, step by step

1. Identify the three experimental groups (water, juice, coffee).
2. Read the on-screen text defining the null hypothesis.
3. Translate the verbal statement into the mathematical equality of the three group means.

Example

On-screen text reads "$H_0$: The mean for all three groups is the same."

Common misconceptions

• Assuming the null hypothesis states that the individual reaction times are identical, rather than the means.

Watch the explanation

Explore next

• Why does the video say to use ANOVA instead of a t-test when there are three groups?
• What do within-group variation and between-group variation mean in this clip?