Homework Help: statistics

Posted by Mich on Tuesday, September 27, 2011 at 10:29pm.

1) A scale measuring prejudice has been administered to a large sample of respondents. The distribution of scores is approximately normal with a mean of 31 and a standard deviation of 5. What percentage of sample had scores below 20?

statistics - michelle, Tuesday, September 27, 2011 at 11:29pm
normalcdf(-100,20,30,5)

0.0228
statistics - PsyDAG, Wednesday, September 28, 2011 at 2:59am
Z = (score-mean)/SD

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to that Z score.

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