00:01
All right, tell there's a new story claim that half of us adults have health issues.
00:05
National poll 12 ,638 were surveyed 6 ,413 had issues.
00:11
We want to test this claim at 5 % significance.
00:14
So we first set up our null and alternative hypothesis.
00:17
Our null hypothesis is that the proportion actually is 0 .5.
00:23
And our alternative is that it's not.
00:27
There's no direction given in the instructions on whether we think it's less is greater.
00:32
We just want to test whether it is or it isn't.
00:35
So we're going to compute a z score and the formulas in the box.
00:39
Before we do that, we need to compute the sample proportion p hat, and that's given as x over n.
00:45
And in this case, x is the number of people with health issues.
00:48
N is the total number in the sample.
00:51
And we'll divide that out and get a decimal.
00:57
0 .507.
01:01
All right...