A sample of 108 college students at NC State University were randomly selected for a survey. The survey participants reported sleeping 6.8 hours a night on average with a sample standard deviation of 1.1 hours. Which of the following are true?
Select one or more:
a. The margin of error at 99% confidence is larger than that at 95% confidence.
b. The margin of error at 99% confidence is smaller than that at 95% confidence.
c. The margin of error is larger with a larger sample size.
d. The margin of error is larger with a smaller sample size.
e. The margin of error would be larger if the sample mean were 7.1 hours instead of 6.8 hours.
f. The margin of error would be smaller if the sample mean were 7.1 hours instead of 6.8 hours.
g. The margin of error would be larger if the sample standard deviation were larger.
h. The margin of error would be larger if the sample standard deviation were smaller.