statistics

solve: our health organization is interested in estimating the average value of outstanding accounts receivable. After selecting a sample of 100 accounts, suppose that the mean was $120 and the standard deviation was $40. Use these data to construct a 98% confidence interval. how do i solve?

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asked by Winona
  1. Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.01 for two-tailed) and its Z score (score in terms of standard deviations).

    98% = mean ± 2.33 SEm

    SEm = SD/√n

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    posted by PsyDAG

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