00:01
Alright, so for part a, to find our alpha value, that is going to be equal to the probability that x is less than or equal to 50, or technically, probability that x is strictly less than 50, or x is strictly greater than 70, which we can find more easily simply by doubling the probability that x is less than 50.
00:32
To find the probability that x is less than 50, we can translate it into a z -score.
00:45
So probability that z is less than, well, actually, i'll note here, okay, yeah, we're dealing with samples of size 100, so a result of, pardon me, i'm tripping on my tongue, a result of a count of 50 is the same thing as a sample proportion of 0 .5.
01:07
The corresponding z -score would be p -hat minus our null hypothesized proportion, p -naught, divided by the square root of p -naught times 1 minus p -naught, divided by n...