00:01
So in this question, we're told that we have n equals 273 teenage girls, and after four years they surveyed, 63 said they smote to stay thin, so n is going to be 63.
00:16
That's the number that say that they smoke to stay thin.
00:19
So let's say that n is binomial, with 273 people trialed and some probability p, that they respond in that way.
00:29
Then we want to find out, is there good evidence that p is greater than 30%.
00:32
So let's say our null hypothesis is going to be that p is 30%.
00:37
And the hypothesis that we're testing is that p is greater than 30%.
00:41
That's what we want to find out.
00:44
So we want to work out our p value for this experiment.
00:47
So the p value is going to be the probability that n is greater than or equal to 63 given that p is 0 .30.
00:58
So this is our basically given that the, this is a given that as well.
01:07
So we're saying that given the null hypothesis is true, what's the probability that we get as or more extreme of the result? and this is something that we can look up in r...