The Following Statement About the Sample Correlation Coefficient Is True $- 1 \leq r _ { X Y } \leq 1$

question 48

Short Answer

The following statement about the sample correlation coefficient is true. a. $- 1 \leq r _ { X Y } \leq 1$ .
b. $r _ { X Y } ^ { 2 } \stackrel { p } { \rightarrow } \operatorname { corr } \left( X _ { i } , Y _ { i } \right)$ .
c. $\left| r _ { X Y } \right| < 1$ .
d. $r _ { X Y } = \frac { s _ { X Y } ^ { 2 } } { s _ { X } ^ { 2 } s _ { Y } ^ { 2 } }$ .

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