In the Preview section at the beginning of this chapter we reported a study by Wegesin and Stern (2004) that found greater consistency (less variability) in the memory performance scores for younger women than for older women. The following data represent memory scores obtained for two women, one older and one younger, over a series of memory trials.
a. Calculate the variance of the scores for each woman.
b. Are the scores for the younger woman more consistent (less variable)?
Younger ____________ Older
8 ............................... 7
6 ............................... 5
6 ............................... 8
7 ............................... 5
8 ............................... 7
7 ............................... 6
8 ............................... 8
8 ............................... 5