Suppose you take a random sample of 100 students at a university, ask them how many hours they slept last night, and find a mean of 7.1hours and a standard deviation of 1.2hours. You then calculate a 95% confidence interval for the mean number of hours all students from that university slept last night.
-Suppose your friend took a random sample of150 students (and had the same sample mean and standard deviation as your sample). How would your friend's 95% confidence interval compare to yours? The friend's interval would be:
A) Wider
B) Narrower
C) Same width
D) Cannot be determined with the information provided

Question

Quizplus · Accepted Answer

A larger sample size results in a narrower confidence interval, assuming the same sample mean and standard deviation.

Suppose You Take a Random Sample of 100 Students at a University