A random sample of 81 scores has a mean of 12 and a standard deviation of 4.5. Therefore, the approximate 95.44% confidence interval around m (using z?/2) is ______..
a. [0.31, 23.69]
b. [7.50, 16.50]
c. [9.40, 14.60]
d. [11.00, 13.00]
Ans: D
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