00:01
Okay, so we want to test whether or not these internet users visit a particular website more than, or different from the national average.
00:17
So on the right hand side here we have the relevant statistics from the problem.
00:22
So our null hypothesis is that the average is equal to 36.
00:28
That's what's given as the population mean.
00:33
And our null, our alternative rather, is that it's different or not equal to 36.
00:38
They don't give a direction.
00:39
They don't say less or greater than they just say different from or differs from.
00:43
So that means it's not equal to.
00:44
That makes us a two -tailed test.
00:50
Two -tailed test.
00:54
And it's a t -test because we don't know the population standard deviation and it's a small sample size of 24.
01:00
So to figure out the critical t, we're going to use degrees of freedom, which is n minus 1, 23, along with the significance level of the problem, 0 .01.
01:12
So if we go to our t table and look for that, 23 degrees of freedom at 0 .01 significance.
01:21
And two tails gives us a t score of 2 .5...