Module 9 Summary: Comparing Groups and Effect Sizes

What You Practised

You practised how to compare groups using magnitude, uncertainty, and practical meaning.

Keep These Ideas

• A group comparison should name the groups, metric, and sample sizes.
• Effect size asks how large the difference is.
• A result can be statistically visible but practically small, or practically important but uncertain.

Writing Habit

The three-practice-quiz group shows a larger average score than the no-practice group, but the comparison should still mention spread and assignment conditions.

Before Moving On

You are ready for the next module when you can explain the module idea without reading the answer key and can name the main unsafe claim to avoid.