00:01
So i see that you need help with this question.
00:03
And so the first thing that you did is you got the scatter plot correct.
00:09
As you can see that there's a positive correlation.
00:14
So positive correlation.
00:20
So as the time increases, so the tip increases or tends to increase.
00:34
So we need to find the correlation coefficient, what r equals.
00:39
And so in order to do that, you have to calculate your sum of your products, which is the difference between your x minus the mean of x and your y minus the mean of y.
00:55
You have to square them.
00:56
So you take x minus your mean of x.
01:00
You square it.
01:02
You add them together.
01:06
And you get your sum of your squares of x, which is 3926 .48.
01:17
Then you're going to do the same thing for y minus the mean of y.
01:23
And you're going to square it, add them, and then add them together.
01:27
And you get your sum of your squares of y, which in this case is, see, so y minus the mean of y squared, and that's 93 .37...