For a certain data set the regression equation is y = 21 - 3x.The correlation coefficient between y and x in this data set ___.
A)must be 0
B)is negative
C)must be 1
D)is positive
E)must be 1

Question

For a certain data set the regression equation is y = 21 - 3x.The correlation coefficient between y and x in this data set ___.
A)must be 0
B)is negative
C)must be 1
D)is positive
E)must be >1

Quizplus · Accepted Answer

The negative coefficient of x in the regression equation indicates a negative correlation between y and x. Therefore, the correlation coefficient must also be negative.

For a Certain Data Set the Regression Equation Is Y