00:01
We have some data here and ultimately it gives us a 95 % confidence interval for those in favour of the death penalty.
00:10
So in favour is 0 .65 to 0 .691.
00:19
We want to get a 95 % confidence interval for those against the death penalty.
00:26
Okay, so i'm going to write out the formula that they would have used to calculate this competence interval.
00:31
Interval, a confidence interval for a competence interval for a population proportion based on a sample is given by the sample proportion, p -hat, plus and minus z -route p -hat, 1 -p -hat over n.
00:49
And we've been given this information here.
00:52
So you could say, okay, the sample proportion who were in favour was 0 .673, so those against would be 0 .327.
01:04
Take that, put it into this formula with the appropriate values.
01:08
You'd have to get z from a level of confidence, and you would get the 95 % confidence interval...