Calculate the multiple correlation coefficient \((R)\) for each of the following situations (the descriptive statistics are on the left and the correlation matrix is on the right):

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d. b. a. X2 Y Y N 25 25 25 X Mean 3.53 2.76 3.30 X2 .17 SD 1.04 .97 1.25 Y .31 .44 X X Y X X2 Y N 43 43 43 X - Mean 6.91 1.35 14.22 X2 .12 SD 1.78 .46 2.90 Y .46 .08 Y X N 19 19 19 X Mean 7.42 22.80 3.16 X .39 SD 2.09 3.27 1.17 Y .51 51 .48 X X Y X N 64 64 64 X1 Mean 63.60 78.27 84.02 X .42 SD 9.54 11.93 10.71 Y .17 .33 Y