00:01
Okay, so in part a, we have a scattered diagram for the book value versus the earnings.
00:07
We have the book value on the x axis and the earnings on the y axis.
00:14
We get using a mini tab, which is given looking something like this here.
00:20
And then for part b, we let x denote the book value and y denote the earnings.
00:29
And then we have that the mean x bar is equal to the sum of each xi divided by n.
00:36
That's going to be 182 .22 divided by 10, which is going to give us 18 .22.
00:47
And then we get that our mean y bar is going to be equal to the sum of each y sub i divided by n.
00:55
That's equal to 25 .18 divided by 10, which is going to be equal to 2 .518.
01:04
Okay.
01:05
And then we want to compute these sample covariance.
01:09
So that's going to be s sub xy, which is going to be equal to the sum of each x sub i minus x bar and then times each y sub i minus y bar divided by n minus 1.
01:27
So divided by n minus 1...