The average NPI-16 score for a random sample 36 of Facebook users is 9, with a standard deviation of 4.2. What is the 95% confidence interval around m?
a. [7.58, 10.42]
b. [7.56, 10.44]
c. [7.60, 10.40]
d. [7.65, 10.35]
Ans: A
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