00:01
In this question, we're given that sales volumes for the last weekend for four car dealerships.
00:06
So the first sample, sample one, we're given that 33, 24, 19, 45, and 30.
00:18
First sample two, we're given 41, 32, 19, 22, and 43.
00:27
For sample 3, 45, 13, 21, 33, and 36.
00:34
And for sample 4, we're given 17, 20, 46, 31, 28.
00:40
And we want to find the variance in the distribution of sample means.
00:44
So first of all, we want to find mu 1, mu 2, 2, 2, 2, 2, 2, and mu 4.
00:50
And so we can just do this by plugging into a calculator.
00:55
And so lots of different ways you could do this.
00:59
I think the easiest way will be to just calculate the mean directly.
01:04
And so for the first one, we just add up all the values.
01:13
And then we want to divide by five because there's five total values.
01:19
And we get 30 .2.
01:23
So now i'm going to do the same thing with the second one...