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Posted by on Wednesday, May 9, 2012 at 11:47pm.

The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 18. A random sample of 310 salespeople was taken and the mean number of cars sold annually was found to be 71. Find the 94% confidence interval estimate of the population mean.

  • statistics - , Thursday, May 10, 2012 at 9:59am

    94% = mean ± 1.88 SEm

    SEm = SD/√n

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