1. In the extensive study involving thousands of British children, Arden and Plomin (2006) found significantly higher variance in intelligence scores for males than for females. Following are hypothetical data, similar to results obtained in study. Note that scores are not regular IQ scores but have been standardized so that complete sample has mean of M = 10 and standard deviation of s = 2.

a. Compute mean and the standard deviation for the sample of n = 8 females and for sample of n = 8 males.

b. Based on means and standard deviations, describe differences in intelligence scores for males and females.

Female  Male
9           8
11        10
10        11
13        12
8           6
9         10
11        14
9           9