00:01
We have been given a confidence interval.
00:03
The interval is 0 .63 to 0 .69.
00:08
First of all, we want to interpret this confidence interval.
00:12
It's a 95 % confidence interval, so it means we are 95 % confident that the population proportion, p, is in this interval.
00:30
Here, that is the proportion of us adults who would favour such an amendment.
00:38
Part b.
00:39
What is the point estimate that was used to make this interval? so this is one way of writing a confidence interval.
00:45
Another way of writing it has the point estimate plus and minus the margin of error.
00:56
So the point estimate is in the centre of this interval.
00:59
So to find it, i'm going to just say, okay, 0 .63 plus 0 .69 over 2.
01:06
That gives me the halfway point, 0 .655, or no, 0 .66...