A fair coin is flipped 4 times. If X and Y are the number of heads and tails obtained, respectively, determine the covariance of X and Y .

Suppose two variables A and B are correlated. Increase or deacreasea.) If A and B are positively correlated, as A increases in value, B will     .b.) If A and B are negatively correlated, as A increases in value, B will     .c.) If A and B are positively correlated, as A decreases in value, B will     .d.) If A and B are negatively correlated, as A decreases in value, B will     .

Calculate the correlation coefficient r, letting Row 1 represent the x-values and Row 2 the y-values. Then calculate it again, letting Row 2 represent the x-values and Row 1 the y-values. What effect does switching the variables have on r? Row 1 19 23 31 49 51 70 79 Row 2 156 155 190 141 202 191 181 Calculate the correlation coefficient r, letting Row 1 represent the x-values and Row 2 the y-values. r= 0.430 (Round to three decimal places as needed.) Calculate the correlation coefficient r, letting Row 2 represent the x-values and Row 1 the y-values. (Round to three decimal places as needed.)

Page 34 Compute the correlation coe cient, r, for the following table: X 10 y 5 12 15 16 1 4 6 18 1 9 7 8 1 25 12 14 17 3 6