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Posted by on Thursday, October 13, 2011 at 9:28am.

A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 20

  • statistics - , Thursday, October 13, 2011 at 10:29am

    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

  • Can someone help me please? - , Thursday, October 13, 2011 at 12:32pm

    Statistics confuses me....thank you for your help :)

  • Can someone help me please? - , Friday, July 13, 2012 at 7:52pm

    A z-score is 0.6 standard deviations above the mean.

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