00:01
Use the given data to find the equation of the regression line.
00:05
Round the final values to three significant digits if necessary.
00:09
We can use a graphing calculator to do this.
00:14
But if we have to, if we're unlucky enough that we have to do it by hand, we can.
00:18
So there's some pieces of data that will be helpful to have.
00:24
And so i'm going to expand my table.
00:29
I want to find the product of x times y.
00:32
I want to find x squared.
00:33
And i want to find y squared.
00:36
So filling in this information will make using my formulas for slope and y intercept a lot easier.
00:45
But this takes a little bit of time.
00:47
So x, y is just multiplying your x times your y value.
00:51
X squared is squaring your x value.
00:58
And y squared is squaring your y value.
01:03
So the first step is filling that out because you're going to need that information.
01:10
And really what we need is we need the information that i'm going to fill out now.
01:14
I need to know the sum of my x, the sum of my y, the sum of my y, the sum of my x, y, and the sum of my x squared, and the sum of my y squared.
01:26
So once i have my information, now i'm going to want to fill in these sums...