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A simple random sample of 70 items resulted in a sample mean of 90. The population...

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Statistics

A simple random sample of 70 items resulted in a sample mean of90. The population standard deviation is

σ = 15.

A. Compute the 95% confidence interval for the population mean.(Round your answers to two decimal places.)

B. Assume that the same sample mean was obtained from a sampleof 140 items. Provide a 95% confidence interval for the populationmean. (Round your answers to two decimal places.)

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