00:01
Okay, so here we have that an airline company is going to be interested in improving customer satisfaction rate from the 62 % currently claimed.
00:09
So the company here sponsored a survey of 228 customers and found that 155 of them were satisfied.
00:17
So we have that our null hypothesis, h -0, is p's equal to 0 .62.
00:23
Our alternative hypothesis is that p is greater than 0 .62.
00:27
So here we have that n is equal to 228, and we have that x is equal to 155, and we have that our significance of alpha alpha is 0 .05.
00:47
Okay, so we get the p hat is then x over n.
00:51
So here we have this.
00:53
P hat is going to be equal to 155 over 228, which is going to be equal to about 0 .679.
01:08
So for our test statistic, for our p value 0 .62, our q value, q is going to be 1 minus p, so that 0 .38.
01:16
So we get that q is 0 .38.
01:21
We then get that z is going to be equal to p -hat minus p divided by the square root of p times q over n.
01:32
So that's going to be equal to ends up being 0 .059 divided by, well, 0 .62 times 0 .38 divided by 22 .8...