00:01
All right, here we have this problem where wood frogs are adapted to survive cold winters by hibernating, and they have this measurement that the number of days spent hibernating isn't any different than what it was in 1980.
00:18
So that's what we're going to call our null hypothesis.
00:21
Our null hypothesis is that our mu is no different from what it was in 1980, which is that it was 40 days.
00:28
So our mu is still equal to 40 days.
00:33
Right? and so what we're saying is, well, actually, let me, it doesn't equal.
00:37
I should use a colon right there.
00:39
Our null hypothesis is that our average is not different than it used to be.
00:46
And so if we fail to reject ho, fail to reject, now what does that mean? it means that, well, it turns out that this was still true...