Module 9 Checkpoint: Comparing Groups and Effect Sizes
Scenario
Two groups of 1,500 differ by 0.4 points on a 100-point scale, with p = 0.002. The team plans a redesign on the strength of it.
Questions
- Is the difference statistically distinguishable from zero?
- Is 0.4 points on a 100-point scale worth acting on? Say what you would need to know.
- Explain how a difference this small produced a p-value this small.
- What figure should have been agreed before the analysis, and why?
- Write the recommendation you would actually make.
Pass Standard
You pass when you can separate statistical significance from practical significance and say which figure decides the action.