00:01
All right.
00:02
So for this problem, we are just testing for difference.
00:09
So we'd have that the null hypothesis is going to be that, or pardon me, not just testing for difference.
00:18
We're testing to see if the difference is more than 7 ,000.
00:21
So the null hypothesis here would be that mu, oops, not n, be that mu 1 minus mu 2 is, and this is, and this is, one thing that's a little bit frustrating.
00:32
I've seen the approach here change from book to book.
00:37
I've often seen it stated that a null hypothesis statement is always a statement of equality, but clearly that's not going to be the case here.
00:49
So i'd say double check with your textbook, because technically it should be mu 1 minus mu 2 is equal to 7 ,000 based on what i've seen previously, but given the available options, we'd have mu1 minus mu 2 is less than or equal to 7 ,000 as the null hypothesis and mu 1 minus mu 2 is greater than 7 ,000 as the alternate hypothesis.
01:16
We are at the alpha equals 0 .1 level of significance.
01:20
So the critical z value is going to be z for a one -tail proportion of 0 .1...