Posted by Jennifer on Thursday, October 13, 2011 at 9:28am.
The "standard score" is more commonly called the "z-score".
It is the number of "standard deviations" above the mean.
The standard deviation is the square root of the variance, or 5 in this case.
The number of data values is not needed to answer the question.
A data point of 20 is one standard deviation above the mean of 15, so the standard or "z" score is 1.0
Statistics confuses me....thank you for your help :)
A z-score is 0.6 standard deviations above the mean.
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