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IQ tests are designed to yield results that are approximately Normally distributed. Researchers think believe that...

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Statistics

IQ tests are designed to yield results that are approximatelyNormally distributed. Researchers think believe that the standarddeviation, σ, is 15. A reporter is interested in estimating theaverage IQ of employees in a large high-tech firm in California.She gathers the IQ information on 22 employees of this firm andrecoreds the sample mean IQ as 106. Let X represent a randomvariable describing a person's IQ: X~N(µ, 15).

a. Find the standard error of the sample mean.

b. Calculate a 90% confidence interval.

c. Interpret the confidence interval in the context of theproblem.

( Need excel form )

Answer & Explanation Solved by verified expert
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Solution Given thatPoint estimate sample mean 106Population standard deviation    See Answer
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