00:01
So our question says a college admission officer for an mba program has determined that historically applicants have undergraded grade points average that are normally distributed with a standard division of 0 .45.
00:12
From a random sample of 25 applications from the current year, the sample mean grade point average is 2 .90.
00:19
So we are supposed to construct a confidence interval for the population mean at 5 % level of significance.
00:25
I don't think the second question is part of the whole thing.
00:28
So it is not part of it.
00:31
So we are just focused on everything here.
00:34
So our population standard division is 0 .45.
00:37
Our sample size is 25.
00:40
Our sample means x bar.
00:41
Now the question says at 5 % level of significant which is being placed that we are constructing in 95 % confidence interval.
00:49
So to do so we have that mule is equal to x bar plus or minus...