Question

1. Variable X and Y have a correlation coefficient of .75. If you multiple all the values of variable X by 2 and all values of variable Y by -4, what is your new correlation coefficient?

   	A.	r =-.75
   	B.	r =.75
   	C.	It cannot be determined without the raw data
   	D.	r =.25

Answer 1

Variable X and Y have a correlation coefficient of .75. If you multiple all the values of variable X by 2 and all values of variable Y by -4, what is your new correlation coefficient?

One of the Property of r is :

r does not change if the scale on either variable is changed. You may multiply, divide, add, or subtract a value to/from all the x-values or y-values without changing the value of r.

So here also r will not change.

Answer will be same.

Answer: 0.75