Comparing Sample Variances Between Groups
In a study on visual acuity, the number of eye chart letters (out of 50) correctly identified was recorded for two age groups. For participants aged 45–55, the scores were 48, 45, 46, 47, 44, 46, 45, and 47. For participants aged 65–75, the scores were 42, 40, 38, 41, 39, 40, 41, and 38. What is the difference in the sample variance between the two groups?
A
0.42
B
1.50
C
0.75
D
0.93
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