00:01
Okay, so we have this setup here.
00:03
We want to test this hypothesis.
00:05
Alpha at 0 .01, we have a null hypothesis that the mean is equal to 50 .1.
00:13
And our alternative is that the mean is greater than 50 .1.
00:21
So we have a right -tailed test here.
00:25
So that means i have a right -tail with an area of 0 .01.
00:31
And i want to find the critical value.
00:32
So we're going to use a t test here because i don't know the population standard deviation.
00:37
I know the sample standard deviation.
00:41
We could probably use a z test here to be similar enough, but generally, if you don't know the population standard deviation, a t test is safer.
00:50
So the critical value for t with n minus 1 degrees of freedom is going to be t.
01:04
With 56 degrees of freedom.
01:07
And if you use a calculator for this, you'll get a more accurate answer.
01:11
You can use a t -table, but it's not going to give you 56 probably, so you'd have to choose either 50 or 60...