Homework Help: statistics

Posted by Mary on Thursday, April 16, 2009 at 10:25pm.

A person scores 81 on a test of verbal ability and 6.4 on a test of quantitative ability. For the verbal ability test, the mean for people in general is 50 and the standard deviation is 20. For the quantitative ability test, the mean for people in general is 0 and the standard deviation is 5. Which is this person’s stronger ability: verbal or quantitative? Expalin your answer to a person who has never had a course in statistics.

statistics - PsyDAG, Friday, April 17, 2009 at 12:25pm
Calculate Z score for both tests and compare.

Z = (X - μ)/SD, where X = score, μ = mean and SD = standard deviation.

The Z score give the person's relative position in a group of scores.

I hope this helps. Thanks for asking.

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