APFIVE Comparing Sample Variances Between Groups
A researcher studied the decline in visual acuity with age by measuring the number of eye chart letters correctly identified at 20 feet (out of 50 possible letters). The scores for participants aged 45-55 were: 48, 45, 46, 47, 44, 46, 45, 47. The scores for participants aged 65-75 were: 42, 40, 38, 41, 39, 40, 41, 38. Calculate the difference in sample variance between the two age groups.
A
0.93
B
0.42
C
1.50
D
0.75
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