00:01
For this problem, we have been given a confidence interval.
00:04
So let's write it down.
00:07
The lower bound of the confidence interval is 20 and the upper bound is 24.
00:12
And using this information, we want to find the point estimate of the population mean.
00:17
This is a confidence interval for our population mean.
00:20
And we also want to find the margin of error for this confidence interval.
00:24
To do that, let's remember how a confidence interval is constructed for population mean.
00:28
You take your point estimate, which is the mean of your sample, and then you add or subtract the margin of error term to get the endpoints of your confidence interval.
00:41
So what that means for us is that x -bar minus the margin of error is going to be equal to 20, since that's the lower end of our confidence interval, and x -bar plus margin of error will be equal to 24...