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

Multiple Choice

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 you took another sample of 100 students and this time find a mean of 6.8 and a standard deviation of 1.2 for the hours slept. You then used these new statistics to create another 95% confidence interval for the mean number of hours slept for all students. How would your new 95% confidence interval compare to your old one? Your new 95% confidence interval would be:

A) Wider
B) Narrower
C) Same width
D) Cannot be determined with the information provided