Question

x (inches) 20 24 36 41 46
y (pounds) 2 4 12 15 20
-The linear correlation coefficient would be positive
Using the data, what is the sample correlation coefficient r ? Round your answer to three decimal places.

Answer 1

Did you see the equation that let you calculate r from values of x and y ?

Answer 2

Do you mean, the formula you have to put in calculator?

Answer 3

Yeah it looks something like this.

Answer 4

But I think this is too much work, maybe you have something more easy to work with ?

Answer 5

I was given some directions on how to enter it into the calculator

Answer 6

You mean you enter the x and y values to the calculator and it automatically calculates r for you ?

Answer 7

It creates a scatter plot

Answer 8

I found this tool online that calculates r from x and y values.
http://www.socscistatistics.com/tests/pearson/Default2.aspx

According to it r=0.996 in our case. I think it's meaningless to just do all that work by yourself, just basic calculations.

Answer 9

Wow, that's really useful! Thanks again

Answer 10

No probs !