24. Arden and Plomin (2006) published a study report- ing that IQ scores for boys are more variable than IQ scores for girls. A researcher would like to know if this same phenomenon applies to other measures of cognitive ability. A standard cognitive skills test is given to a sample of n - 15 adolescent boys and a sample of n = 15 adolescent girls, and resulted in the following scores. Boys Girls 95397 6 54 6 7 5 248 8 6476 8 74973 5 7 8 6 5 a. Compute the mean, the variance, and the standard deviation for each group. b. Is one group of scores noticeably more variable than the other