stat

Forty-nine items are randomly selected from a population of 500 items. The sample mean is 40 and the sample standard deviation 9.




Develop a 99% confidence interval for the population mean

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  1. Z = (score-mean)/SEm

    SEm = SD/√n

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (±.005) and the Z score. Insert data into first equation to solve.

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