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Math Help - large sample, confidence interval

  1. #1
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    large sample, confidence interval

    Information was collected froma random sample of 20 of the 2000 employees in a factory about the amount of money they were carrying. The mean amount was found to be $5.25 and the estimated standard deviation was 2. On the assumption that the amount of money per person is normally distributed, find a 95% confidence interval for the total amount of money carried by the 2000 emplyees of the factory. The answer somehow is (8630,12370) but I can't quite see how this was achieved. If anyone knows how this was found they'b be a great help. many thanx
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by oxrigby View Post
    Information was collected froma random sample of 20 of the 2000 employees in a factory about the amount of money they were carrying. The mean amount was found to be $5.25 and the estimated standard deviation was 2. On the assumption that the amount of money per person is normally distributed, find a 95% confidence interval for the total amount of money carried by the 2000 emplyees of the factory. The answer somehow is (8630,12370) but I can't quite see how this was achieved. If anyone knows how this was found they'b be a great help. many thanx
    Find the 95% confidence interval for the mean and multiply by 2000.

    Incidentally this should use small sample statistics as the relevant sample size is 20 not 2000.

    CB
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