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    Solving for Confidence Intervals

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    Question: A sample of 240 observations is selected from a normal population for which the population standard deviation is known to be 24.The sample mean is 20.

    (a) Determine the standard error of the mean. (Round your answer to 3 decimal places)
    (b) Determine the 90% confidence interval for the population mean. (Round your answer to 3 decimal places)

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    Solution Preview

    a) Standard error of the mean = population standard deviation/sqrt (sample size) ...

    Solution Summary

    The expert examines solving for confidence intervals for 240 observations.