Comparing Crystallized and Fluid Intelligence
In a psychological study, the crystallized and fluid intelligence of 15 adults aged 65–75 were measured on a 10-point scale. The collected scores for crystallized intelligence were 8, 7, 9, 8, 7, 8, 9, 7, 8, 8, 7, 9, 8, 7, 8, and the scores for fluid intelligence were 6, 5, 7, 6, 5, 6, 7, 5, 6, 6, 5, 7, 6, 5, 6. Based on this data, what is the difference between the mean crystallized intelligence score and the mean fluid intelligence score?
A
1.5
B
2.5
C
2.0
D
1.8
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