You are given the sample mean and the population standard
deviation. Use this information to construct...
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You are given the sample mean and the population standarddeviation. Use this information to construct the 90% and 95%confidence intervals for the population mean. Interpret the resultsand compare the widths of the confidence intervals. From a randomsample of 35 business days, the mean closing price of a certainstock was $105.84. Assume the population standard deviation is$10.29.
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sample mean xbar 10584 sample standard deviation 1029 sample size n 35 Given CI level is 90 hence 1 09 01 2 012 005 Zc Z2 16449 ME zc sqrtn ME 16449 1029sqrt35 ME 2861 CI xbar Zc ssqrtn xbar Zc
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