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11. A local health care company wants to estimate the mean weekly elder day care cost. A sample of 10 facilities shows a mean of $250 per week with a standard deviation of $25. What is the 90 percent confidence interval for the population mean?

  • statistics -

    Use a confidence interval formula:

    CI90 = mean ± 1.645(sd/√n)
    ...where ± 1.645 represents the 90% confidence interval using a z-table, sd = standard deviation, √ = square root, and n = sample size.

    Plug your data into the formula to calculate the confidence interval.

    I hope this will help get you started.

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