Standard Deviation of Experimental Data
A psychologist conducted a study on insight learning, measuring the time in minutes it took eight children to solve a puzzle box before and after watching a demonstration. The ‘before’ times were 12, 15, 11, 14, 13, 16, 12, 13, and the ‘after’ times were 5, 6, 4, 5, 5, 7, 4, 4. What is the standard deviation of the ‘after’ times?
A
1.06
B
0.89
C
1.25
D
1.43
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