# Math Help - Correlation Coefficient - Have I done this right?

1. ## Correlation Coefficient - Have I done this right?

Hey,

I have an exam on tuesday, and just revising.

I would like to know if I have done this right.

The reason I have wrote down the whole number from the calculator throughout the working out is a longggg story... basically because I am using a different formula to the one we have revised at university, where I have to find the value of X in this one....yes I do know how to round up but this wont give a definate answer as to whether the correlation is negative or positive.. but anyway here it is, I done it on Word and then print screened it...

2. Originally Posted by leaaa
Hey,

I have an exam on tuesday, and just revising.

I would like to know if I have done this right.

...
Hello,

1. why don't you use the build-in function of Excel to calculate the correlation coefficient?
It will return r = 0,877458866

2. I've got a different value for $\sum \gamma^2 = 15.05$

3. All other calculations seem to be OK.

3. Originally Posted by earboth
Hello,

1. why don't you use the build-in function of Excel to calculate the correlation coefficient?
It will return r = 0,877458866

2. I've got a different value for $\sum \gamma^2 = 15.05$

3. All other calculations seem to be OK.
Hey, thanks for your reply, I cant use excel in my exam its a written one. I dont really understand where they got those values from, how did you get 15.05?

Thanks x

4. Originally Posted by leaaa
Hey, thanks for your reply, I cant use excel in my exam its a written one. I dont really understand where they got those values from, how did you get 15.05?

Thanks x
Hello,

1. I've made a silly typo. But the final result I got differs slightly from your's.

2. To show you where these values come from I attach the complete spread-sheet.

I hope this will help a little bit further on.

5. hey thanks for your reply and your help, i understand where this value comes from now.

So would you say that i got this question wrong? As the difference between my reult and yours is 0.1 or something? x