Which of the following is a property of r , the coefficient of correlation? A) A

Question

Which of the following is a property of r, the coefficient of correlation?

A) All of these choices are true.

B) r always lies between 0 and 1.

C) A correlation of 0 always indicates that the relationship between X and Y is quadratic.

D) A correlation of -0.35 is weaker than a correlation of 0.15.

E) If you switch the values of X and Y, the sign of r changes.

F) r has no units (that is, it is a "unitless measure")

A) All of these choices are true.

B) r always lies between 0 and 1.

C) A correlation of 0 always indicates that the relationship between X and Y is quadratic.

D) A correlation of -0.35 is weaker than a correlation of 0.15.

E) If you switch the values of X and Y, the sign of r changes.

F) r has no units (that is, it is a "unitless measure")

Explanation / Answer

B and F are corrct for Coefficient of correlation r .

C ) correlation of zero , indicated that there is no linear relation between X and Y , it does not tell you anything more.

D ) if correlation is 1 or -1 , then there is a linear relation between X and Y , so -.35 is better thn .15

E) use the definiton of correlation , it does not matter whaether you switch X and Y or not ( that means it doenont measure which is cause and which is effect )

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