Module 7 Checkpoint: Sampling Variation and Confidence Intervals
Scenario
A sample of 200 users reports 42% satisfaction, with a confidence interval of 35% to 49%. A manager writes "satisfaction is 42%" in a board paper.
Questions
- Rewrite the sentence so it reflects the interval.
- What does the interval's width tell you about the sample size?
- Roughly what would happen to the interval with 800 users instead of 200?
- The target is 45%. What can and cannot be concluded about whether it was met?
- Explain in one sentence what the 95% in "95% confidence" refers to.
Pass Standard
You pass when your rewritten sentence carries the interval, and you can say what the 95% is a property of.