00:01
For this question, they are given 12 numbers.
00:03
So what we have to do, first of all, the sample size is 12.
00:07
So we need the sample mean, which is x bar, and the sample standard division, which is s here.
00:12
So i'm going to get these values using the calculator.
00:14
Press the button stat, just press enter.
00:17
So we just put these numbers here.
00:19
I previously just put the numbers to just earn some time.
00:23
And then the next step, press button stat, and the calculation tab, one variable statistics, press enter.
00:29
So the mean here, which is 73 .02, and the standard deviation for the sample, which is s value, this is 3 .87 here, and the confidence level.
00:40
So the confidence level was given as 80%.
00:43
So we have to find the confidence interval for the mean.
00:47
So we don't know the population standard division.
00:49
Because of that, we are going to use the t distribution...