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A simple random sample of 90 items from a population with σ = 7 resulted in...

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Statistics

A simple random sample of 90 items from a population with σ = 7resulted in a sample mean of 33. If required, round your answers totwo decimal places.

a. Provide a 90% confidence interval for the population mean.to

b. Provide a 95% confidence interval for the population mean.to

c. Provide a 99% confidence interval for the populationmean.

Answer & Explanation Solved by verified expert
3.6 Ratings (291 Votes)
Solution Given thataSample size n 90Z2 1645Margin of error E Z2n 1645 7 90Margin of error E 121At 90 confidence interval estimate of the    See Answer
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