00:01
Hey there, welcome to numeraid.
00:03
We are looking at the x and y variables here, price and number of pens, in which he knows the number of pens that he sells each of these weeks here.
00:14
So for part a, you are first going to identify the dependent variable.
00:20
So for the dependent variable, what we are looking at here is is, so we have the dependent as the number of pen, because based on price, it's based on how many units are sold.
00:38
So we have dependent as the number of pens, and the independent as the price.
01:01
Let's go ahead and include the units also.
01:09
Okay, now we're gonna find for part b, the correlation coefficient r.
01:15
We have r equals the sum of x minus the mean.
01:28
So we're gonna find both x and y means.
01:31
X mean we have 20 .8 times y minus its mean we have 50 .2.
01:41
All right, so we're gonna divide this, square root it, and then we are going to, let's actually use a ruler here to divide.
02:05
All right, and then from here we are dividing by the sum of squares of x times the sum of squares of y.
02:27
Giving us a correlation coefficient here...