SS works well b. Is one group of scores noticeably more variable (more diverse)
ID: 3051889 • Letter: S
Question
SS works well b. Is one group of scores noticeably more variable (more diverse) than the other? ousands of in (2006) found 24. In the previous problem we noted that the differ- ences in cognitive skills tend to be bigger among older people than among younger people. These differences are often called diversity. Similarly, the differences in performance from trial to trial for the same person are often called consistency. Research in this area suggests that consistency of perfor- mance seems to decline as people age. A study by Wegesin and Stern (2004) found lower consistency (more variability) in the memory performance scores for older women than for younger 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 e intelligence Following are esults obtained are not regular ized so that M 10 and dard deviation for d for the sample of ndard deviations, ligence scores for womarn b. Are the scores for the younger woman more con- sistent (less variable)? Younger Older ces that exist from called diversity e skills for youngerExplanation / Answer
24)
a)
For younger woman
using this mean we can calculate variance
Variance = sum((Y-M)^2)/8 = 5.5/8 = 0.6875
Older Woman
using this mean we can calculate variance
Variance = sum((O-M)^2)/8 = 11.875/8 = 1.4844
b) Thus, Younger woman(s = 0.6875) is consistent compared to old woman (s= 1.4844)
Total Mean(M) Younger(Y) 8 6 6 7 8 7 8 8 58 7.25Related Questions
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