00:01
Okay, in this problem we have a new study that claims that the average age of people who play video games is 25 years.
00:07
Okay, so we're going to first state that our null hypothesis is that our population, uh, well, so we'll say h0, our population mean mu is going to be equal to 25.
00:18
Okay, so our alternate hypothesis is going to be that mu is not equal to 25.
00:24
All right, so we take a sample of 50 video game players, so we have our n is equal to 50.
00:28
It's taken and the average age is found to be 27 years, so our x bar is going to be equal to 27, and our sample standard deviation s is found to be 5.
00:40
All right, so we're going to perform a hypothesis test to determine if the average age of people who play video games is more, uh, sorry, is different from 25 years.
00:50
So, uh, we have our null and alternate hypotheses already.
00:54
Now, we're going to do a z test.
00:56
It's just a standard test.
00:58
We're going to do it at a 95 % confidence interval, so 95 % confidence interval.
01:03
That's kind of the standard.
01:04
We could do something higher or lower...