Calculating Difference in Variance
A study on the effect of age on visual acuity recorded the number of eye chart letters (out of 50) correctly identified by two groups. For participants aged 45–55, the scores were 48, 45, 46, 47, 44, 46, 45, 47. For participants aged 65–75, the scores were 42, 40, 38, 41, 39, 40, 41, 38. Based on these data, what is the difference in variance between the two groups?
A
0.75
B
0.93
C
1.25
D
1.50
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