statistics

posted by Brittany

Children below the 30th percent are in need of special assistance assistance what raw score makes the cut off score for these children?

  1. Ms. Sue

    What is the highest raw score possible?

  2. Ms. Sue

    Is that the lowest 30th percentile? Or is it the lowest 30 percent of the total score?

  3. Brittany

    I guess 100 is the highest the mean is 30.9 and the standard deviation 2.08 it just says children below the 30th percentile

  4. PsyDAG

    Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion (.30) and its Z score. (Pay attention to the sign.) Insert Z and other values in equation above to find the cutoff score.

  5. vera

    Please advise-Thank you.
    The Center for Urban Transportation research released a report stating that the average commuting distance in the United States is 10.9 miles Suppose that this average is actually the mean of a sample of 300 commuters and that the sample deviation was 6.2 mi. Estimate the true mean commuting distance using a 99% confidence interval.

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