## Steps and Confidence Intervals in Hypothesis Testing

### Significance Testing and Confidence Intervals

#### Questions

**Question 1 out of 4.**

The null hypothesis for a particular experiment is that the mean test score is 20. If the 99% confidence interval is (18, 24), can you reject the null hypothesis at the .01 level?

- Yes
- No

**Question 2 out of 4.**

Select all that apply. Which of these 95% confidence intervals for the difference between means represent a significant difference at the .05 level?

- (-4.6, -1.8)
- (-0.2, 8.1)
- (-5.1, 6.7)
- (3.0, 10.9)

**Question 3 out of 4.**

If a 95% confidence interval contains 0, so will the 99% confidence interval.

- True
- False

**Question 4 out of 4.**

Select all that apply. A person is testing whether a coin that a magician uses is biased. After analyzing the results from his coin flipping, the p value ends up being .21, so he concludes that there is no evidence that the coin is biased. Based on this information, which of these is/are possible 95% confidence intervals on the population proportion of times heads comes up?

- (.43, .55)
- (.32, .46)
- (.48, .64)
- (.76, .98)
- (.81, 1.33)