2. A study based on a sample size of 36 reported a mean of 87 with a margin of error of 10 for 95% confidence. a. Give the 95% confidence interval. b. If you wanted 99% confidence for the same study,...

2. A study based on a sample size of 36 reported a mean of 87 with a margin of error of 10 for 95% confidence.

a. Give the 95% confidence interval.

b. If you wanted 99% confidence for the same study, would your margin of error be greater than, equal to, or less than 10?

3. The Student Monitor surveys 1200 undergraduates from 100 colleges semiannually to understand trends among college students. Recently, the Student Monitor reported that the average amount of time spent per week on the Internet was 19.0 hours. Assume that the standard deviation is 5.5 hours. Give a 95% confidence interval for the mean time spent per week on the Internet.