00:01
So, in the given question, we will be conducting a hypothesis test.
00:04
So, here we have a null hypothesis that a population average is 860 and the alternative is that the population average is greater than 860, right.
00:14
So, this is a right tail hypothesis test.
00:18
Now, the size of the sample here is 63, the mean of the sample is 880 and the population standard deviation is 120, right.
00:28
Now, the critical value here, this will correspond to the value of z alpha, right and alpha is 0 .01.
00:36
So, the critical value here, this is z 0 .01 which is 2 .33, right.
00:42
Now, the rejection region here is that we will reject a null hypothesis if our test statistic value is greater than 2 .33.
00:51
Now, the test statistic will be computed by using this formula...
