You have conducted a brilliant study which correlates IQ score with income and find a value of r = 0.75. At the end of the study you find out all the IQ scores were scored 10 points too high. What will the value of r be with the corrected data?
A) r will be increased
B) r will be decreased
C) r will remain the same
D) cannot be determined

Question

Quizplus · Accepted Answer

The correlation coefficient (r) measures the strength and direction of a linear relationship between two variables. It is not affected by changes in the scale or location of the data, such as adding or subtracting a constant from all values of one variable. Therefore, adjusting all IQ scores by the same amount (either up or down) does not change the value of r.

You Have Conducted a Brilliant Study Which Correlates IQ Score