1. Statistics students surveyed 135 students at Tallahassee Community College. From their data we are 95% confident that between 44.7% and 61.9% of all TCC students are female. The students realize that this interval contains a large margin of error. What can they do to make a narrower interval?

a. Survey more students.

b. Use a 99% confidence level.

c. Survey more students and use a 99% confidence interval.

d. None of the other choices.

2. We survey a random sample of American River College students and ask if they drink coffee on a regular basis. The 90% confidence interval for the proportion of all American River College students who drink coffee on a regular basis is (0.262, 0.438). What will be true about the 95% confidence interval for these data?

a. The 95% confidence interval is narrower than the 90% confidence interval.

b. The 95% confidence interval is wider than the 90% confidence interval.

c. The two intervals will have the same width.

d. It is impossible to say which interval will be wider.