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Math Help - Standard Deviation? Predicting error??

  1. #1
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    Post Standard Deviation? Predicting error??

    A computer is programmed to predict test scores and the following are the predicted
    test scores for the 10 students listed below.
    90 90 87 80 42 70 67 60 83 94


    For each student fi nd the error in their predicted score. Then calculate the average and
    standard deviation of these errors. Comment briefly on how well the computer program
    seems to be at predicting scores. Hint: use the interpretation of average and S.D. to
    make this assessment.


    So for standard deviation, I used this formula I found online: How To Calculate Standard Deviation by sonia
    but I'm not sure what it means by "finding the error". Is this the margin of error number? Can someone describe the steps I need to take in order to solve this problem?
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  2. #2
    MHF Contributor
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    Re: Standard Deviation? Predicting error??

    Hey AmmyBabyx3.

    The first thing you need to do is to give a distribution for the scores of the students before you can get parameter estimates (like the standard deviation estimate).

    What kind of model do you have in mind for the students?
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