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    Confidence interval of populations

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    Details: Refer to the OECD data, which reports information on census, economic, and business data for 29 countries.

    a. Develop a 90 percent confidence interval for the mean percent of the population over 65 years.
    b. Develop a 90 percent confidence interval for the mean energy use.

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    https://brainmass.com/statistics/confidence-interval/confidence-interval-populations-16811

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    Z value for 90% confidence = 1.28 ( Normal Tables)
    <br>
    <br>90% confidence Interval = (Mean - Z* Std Dev , Mean + Z* ...

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