00:01
Okay, so here we're testing the null hypothesis that the mean difference is equal to zero versus the alternative hypothesis that the mean difference is not equal to zero, right? and we have some paired data here, which means that the first thing that we're going to do is we're going to take all of officer don't's values and subtract officer meredith's values from each one for each day because they're paired.
00:25
And then when we do that, we have a whole new data set, which is our differences data set.
00:33
All right.
00:34
And so our differences data set is the following, 4, 3, 5, 4, 7, because that's all the differences between each value.
00:44
Okay? so now we are going to do everything on this dataset.
00:50
So we are going to calculate a t test statistic, which will be x bar minus.
00:57
Mean over s over the square root of n and each of those numbers are going to come from this data set right here.
01:04
So first of all the mean from our data set is 4 .6 so that will be my x bar minus the mean from the null hypothesis which is zero divided by the standard deviation of my differences which i calculate to be 1 .517 divided by the square root of 5 because there's five days i did this for...