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Posted by on Friday, March 29, 2013 at 11:25am.

3. Sick-leave records obtained from a random sample of 200 social workers showed a mean number of days sick leave equal to 25.6 last year. If the sample standard deviation is 5.1, construct a 90% confidence interval for the mean number of days sick leave for all social workers last year.

  • statistics3. - , Monday, April 1, 2013 at 7:47pm

    Formula with your data included:

    CI90 = 25.6 + or - 1.645(5.1/√200)

    Calculate for your interval.

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