Statistics Question (Confidence Interval)

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A sample of 15 recent college graduates found that starting salaries for attorneys in New York City had a mean of $102,342 and a standard deviation of $21,756. Construct a 95% confidence interval for the average starting salary of all attorneys in the city.
A. (89869.82, 114814.18)
B. (91331.94, 113352.06)
C. (90292.73, 114391.27)
D. (90371.37, 114312.63)

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