APFIVE Standard Deviation of Experimental Data
A psychologist studied insight learning in children solving puzzle boxes. The data shows the time (in minutes) it took 8 children to solve the puzzle before and after watching a demonstration: Before: 12, 15, 11, 14, 13, 16, 12, 13. After: 5, 6, 4, 5, 5, 7, 4, 4. What is the standard deviation of the ‘after’ scores?
A
1.25
B
0.89
C
1.06
D
1.43
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