Homework Help: Statistics

Posted by Alison on Monday, December 17, 2012 at 11:16pm.

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 ľ, the average annual salary of all high school teachers.

Statistics - PsyDAG, Tuesday, December 18, 2012 at 11:54am
99% = mean ą 2.575 SEm

SEm = SD/√n

I'll let you do the calculations.

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