A random sample of 100 scores has a mean of 15 and a standard deviation of 4. Therefore, the approximate 68.26% confidence interval around m (using z?/2) is ______.
a. [14.60, 15.40]
b. [12.93, 17.07]
c. [11.80, 18.20]
d. [6.74, 23.26]
Ans: A
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