00:01
So we want to test the effective time of this drug.
00:09
And the mean, or the null hypothesis rather, is going to be that the mean is equal to the population mean of 7 .4.
00:17
And an alternative hypothesis is that it's going to be less than 7 .4.
00:21
And the reason for that is because we're claiming that the effect of time is lower than 7 .4.
00:27
That makes us a left tail test.
00:36
So what that's going to do is that's going to allow us to figure out the critical t value.
00:42
And you can get that using the alpha level here and usually you can find that on a t table.
00:51
This is actually a z score, not a t score.
00:55
So let me fix that.
00:56
We're going to find a critical z value.
01:01
Really not major difference between the two.
01:03
But that critical z value is going to be here at negative 1 .282...