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Suppose a 90% confidence interval for the mean salary of college graduates in a town in...

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Basic Math

Suppose a 90% confidence interval for the mean salary of collegegraduates in a town in Mississippi is given by [$45,783, $57,017].The population standard deviation used for the analysis is known tobe $13,700. [You may find it useful to reference the z table.]

a. What is the point estimate of the mean salary for all collegegraduates in this town?

b. Determine the sample size used for the analysis. (Round \"z\"value to 3 decimal places and final answer to the nearest wholenumber.)

Answer & Explanation Solved by verified expert
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Solution Given thatA Lower confidence interval 45783Upper confidence interval    See Answer
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