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A distribution of values follows a N(140,22) distribution. From this distribution you are drawing samples of size 12. Find the interval containing the middle-most 34% of the sample means. Round your values to 1 decimal place.

  • statistics -

    The interval = mean ± 17%.

    Z = (score-mean)/SEm

    SEm = SD/√(n-1)

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.17) between Z score and mean. Insert the values in the first equation and calculate.

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