00:01
So in our hypothesis test, our null hypothesis in part a will be that the mean is equal to 1775, and alternately the mean is higher than 1775.
00:15
Then in part b, we had to describe what type of test, and that would be a z test, a one sample z test.
00:23
So i'm not sure what your options are, so either a z test or one sample z test.
00:29
And then we need to find our test statistic.
00:32
And our test statistic is a z value that we find by taking the x bar that they got, which was 1796, minus the mean that they're assuming, and then the population standard deviation of 70 divided by the square root of 43.
00:48
And when you get that test statistic, i believe you need three decimal places.
00:53
It is 1 .967.
00:56
The next decimal place happens to be a 2.
00:58
But you can do the calculation if you need it to be further decimals.
01:03
And then you need to find what the p value is.
01:06
And the p value is the likelihood of getting a z value that is greater than or equal to this value...