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

b. If a 95% confidence interval contains 0, then the 99% confidence interval contains 0

c. If a 99% confidence interval contains 1, then the 95% confidence interval contains 1

d. If a 95% confidence interval contains 1, then the 99% confidence interval contains 1

**a. If a 99% confidence interval contains 0, then the 95% confidence interval contains 0**

c. If a 99% confidence interval contains 1, then the 95% confidence interval contains 1

c. If a 99% confidence interval contains 1, then the 95% confidence interval contains 1

*The lower the confidence interval, the wider the range, so if a higher confidence interval contains a point, a lower confidence interval will contain that point as well.*