Chapter 20: Testing Hypotheses About Proportions

AP Statistics

Four Step Process of Inference

1. Hypothesis2. Model3. Mechanics4. Conclusion

(See Note Sheet for Detailed Explanation)

When to Reject Null and When to Fail to Reject Null

One-Tailed Test: When to Reject of Fail to Reject Null Hypothesis

Two-Tailed Test: When to Reject of Fail to Reject Null Hypothesis

Two-Tailed Test: When to Reject or Fail to Reject Null Hypothesis

Potential Problems

• Don’t base your null hypothesis on what you see in the data

• Don’t base your alternative hypothesis on what you see in the data

• Don’t make your null hypothesis what you want to show to be true

• Don’t forget to check the conditions

Hypothesis

Method

Mechanics

Conclusion

Other—Confidence Interval