00:01
All righty.
00:03
So we're looking at the placebo effect here.
00:06
So there was a group of size 60 who were given some compound that could have a potential side effect of erectile dysfunction and they were given counseling on that.
00:21
And a group of 50 were given the same compound, but they weren't given the counseling on what could happen.
00:28
And so we're, and of these groups, 40 % of the the counseling group reported they had one or more sexual side effects, whereas the no counseling group had 18%.
00:39
And we want to know if the placebo effect is in effect here.
00:45
Is the placebo effect operating here? so our null and alternative hypotheses are the proportions are equal.
00:54
That's our null.
00:55
They're going to be the same.
00:57
And the placebo effect is basically saying that by saying it is it going to make an effect.
01:09
Sometimes a placebo is a fake medication or treatment and that can sometimes have a positive effect just because patients think about it.
01:21
And it works the same with, there's an article that talked about how the 10 minutes, for patients to be informed of possible side effects will actually experience those side effects.
01:32
It's that same idea.
01:33
Just by knowing about it, your brain will kind of make it happen or you'll think it's happening.
01:39
So that's why the alternative hypothesis is that p1 is greater than p2.
01:44
P1 is our counseling group.
01:46
P2 is our no counseling group.
01:48
All right, so there's that.
01:51
And let's go ahead and run through it.
01:54
So it's going to be a two proportion of z tests, so our formula...