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The mean for a set of test scores is 50 and the standard       deviation is...

The mean for a set of test scores is 50 and the standard       deviation is 5. For a raw score (X) of 55, the corresponding z      score is +1.0. What is the z score if the standard deviation is    2.5? From this example, what can you conclude is the effect of        decreasing the amount of variability of a set of scores on a           standard score (given all else is equal, such as the same raw       score)? Why is this effect important? (10 points).

Math   Statistics-And-Probability   
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