00:01
So there's a psychologist that claims civic engagement relates to life satisfaction.
00:06
So the psychologist wants to test this experiment by assigning, randomly assigning 100 students, and it's 100, and these will, they were given 12 hours of volunteer work, 12 hours, right, so they have volunteer work compared to another group of 100 students that they had no volunteer work, and they were given some life satisfaction survey, and each group had 100 people, and then they're gonna take the mean score, they're gonna, right, take some sample x bar, and they're gonna get some, you know, x bar, we'll call this group one, this is group one, here, this is group two, where one is the 12 -hour, the group that got the 12 hours of volunteer work, where group two is the group of students that had no volunteer work, and you get x bar one and two like that, and let's, we want to state the hypotheses here.
01:26
So the null hypothesis, we could say it in two ways.
01:29
We could say that mu one is equal to mu two, that they're equal, and then the alternative would be that they're not equal, all right, because we're not told that one group would have, we're not asking whether or not one would do more, we're just saying the psych, because the psychologist just claims that civic engagement is related, the keyword is related, not that civic engagement will increase life satisfaction or volunteer work will decrease life satisfaction and everything like that, we're just saying related, so that's why we're saying equal, not equal.
02:08
But you could say this differently in terms of the hypotheses, and it's good to see them both...