00:01
Here we have a sample of 200 students, and our null hypothesis is that the proportion of those who agree as freshmen is equal to the proportion of those as seniors, and we are looking for evidence of some sort of difference in their proportions.
00:17
And the three conditions that you need, so you need to know that the sample was random, which were given, and that's one of them that was kind of given in the question.
00:24
Sometimes we have to check if they were independently chosen, which of our, as long as our population, is big enough, which is pretty reasonable here.
00:33
2 ,000 students is a big enough population to where our sample being selected of 200 is going to kind of diminish that rate of selecting without replacement.
00:46
And then the other thing is we need to know that our sampling distribution of whatever we're doing is approximately normal.
00:51
And for proportions, we need to know that our successes and failures, both of those, are greater than some predetermined number...