00:01
So on this problem, we have our two confidence intervals given, and this is all the lower limit, and this is the upper limit.
00:08
And we know that if we find the mean of these two, that will tell us what the sample estimate is.
00:15
And so for both cases, that's 3 ,1008 .3.
00:20
Now, i've calculated the margin of error.
00:23
So i took the difference between these to find out how far this upper limit is from the mean and got 45 .4.
00:30
And did the same for this other interval and got that the margin of error is 59 .8.
00:37
Now, i know that this is a lesser margin of error, and the margin of air comes from either using a z value with 0 .025 and the upper tail for a 95 % confidence interval times the standard deviation over the square root of n, or it's a t value if we're using the sample...