00:01
I can't tell you exactly what the answer is to this question without having all of the original data, but i can go over how you would go about answering it.
00:08
So to begin, i'll note that the claim that we're being asked to test is, or we're being asked, or actually i guess i'll say it this way, the question is, is there sufficient evidence to support the claim that the drug is effective in lowering blood pressure.
00:35
That's the question.
00:36
Then we would expect what we're trying to see if it's true or not is, is the mean blood pressure after treatment less than the mean blood pressure before treatment? or alternatively, if we consider mu -d to be the average difference after minus before, then this would be equivalent to asking is the mean difference less than zero.
01:22
So that would mean that our null hypothesis here is going to be that the mean difference is equal to zero, while our alternate hypothesis is that the mean difference is less than zero.
01:36
Now, to find the t statistic here, the t statistic, the way that we calculate this is by taking the.....