Statistics
posted by Alison .
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.

99% = mean ± 2.575 SEm
SEm = SD/√n
I'll let you do the calculations.
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