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Posted by on Wednesday, March 6, 2013 at 1:21pm.

In a survey randomly selected subjects, the mean age of the 36 respondents is 40.0 years and the standard deviation of the ages is 10.0 years. Use these sample results to construct a 95% confidence interval estimate of the mean age of the population from which the sample was selected.

  • statistics - , Wednesday, March 6, 2013 at 1:24pm

    95% confidence means that you will have 5% left in the two tails. Split this number in half to get .025 in each tail.
    This is equivalent to a z-score of 1.96

    Use this z-score in the formula to find the confidence interval.

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