00:01
Okay, so continuing on, we now want to get the test statistic.
00:05
So let me write out the information.
00:08
Null hypothesis, population proportion 0 .35.
00:12
Alternative hypothesis, population proportion is not 0 .35.
00:17
Sample size 150, sample proportion 0 .39.
00:22
So i mentioned that we're looking at the sampling distribution, the distribution of possible sample proportions you would get if you took samples of this size.
00:31
And i'll write out that again.
00:32
P hat follows a, well, approximately normal curve.
00:36
Its mean is p, its standard deviation, p1 minus p over n, on that square root sign.
00:42
And i said, okay, we've got the critical values.
00:45
The points that cut off 5%, the 5 % in the extremes split equally between the two tables.
00:51
If our test statistic goes into these rejection regions, we reject the hypothesis...