Average annual salary of all high school teachers

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Reference no: EM1389587

An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find the 99% confidence interval for µ, the average annual salary of all high school teachers.

A. (54837.9 , 58142.1)

B. (54637.9 , 60142.1)

C. (54607.2 , 58372.8)

D. (55398.7 , 57581.3 )

Reference no: EM1389587

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