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    Confidence Intervals and Mean Chloride Level

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    A laboratory in Florida is interested in finding the mean chloride level for a healthy resident in the state. A random sample of 70 healthy residents has a mean chloride level of 102 mEg/L. If it is known that the chloride levels in healthy individuals residing in Florida have a standard deviation of 35 mEg/L find a 90% confidence interval for the true mean chloride level of all healthy Florida residents. Then complete the table below.

    Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place. If necessary, consult a list of formulas.

    What is the lower limit of the 90% confidence interval?
    What is the upper limit of the 90% confidence interval?

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    Solution Summary

    This solution constructs the upper and lower 90% confidence interval for the mean chloride level with all steps shown.