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For a population with a mean of μ  70 and a standard
deviation of   20, how much error, on average,
would you expect between the sample mean (M) and
the population mean for each of the following sample
a. n  4 scores
b. n  16 scores
c. n  25 scores

  • Statistic -

    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 related to the Z scores.

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