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Confidence interval for the population mean

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Reference no: EM131442608

A random sample of 94 customers, who visited a department store, spent an average of $81 at this store. Suppose the standard deviation of expenditures at this store is σ = $20. The 98% confidence interval for the population mean (rounded to two decimal places) is:

  • The lower limit is $ 66.18
  • The upper limit is $ 73.82

Reference no: EM131442608

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