For a biology project you measure the weight in grams and th

For a biology project, you measure the weight in grams and the tail length in millimeters of a group of mice. The correlation is r = 0.52.

If you had measured tail length in centimeters instead of millimeters, what would be the correlation? (There are 10 millimeters in a centimeter.)  

r = ______ (+/- 0.01)

Solution

correlation r =0.52 (given)

Actually correlation coefficient or r has no unit and it is a ratio. Hence if everything is measured in cm instead of mms, correlation coefficient would not change at all.

Hence r = 0.52

(The same irrespective of unit)