Explore BrainMass

Explore BrainMass

    Confidence Intervals and corresponding z-scores

    This content was COPIED from BrainMass.com - View the original, and get the already-completed solution here!

    A cutoff score of 79 has been established for a sample of scores in which the mean is 65. If the corresponding z-score is 1.4 and the scores are normally distributed, what is the standard deviation?

    © BrainMass Inc. brainmass.com June 3, 2020, 4:57 pm ad1c9bdddf
    https://brainmass.com/statistics/confidence-interval/confidence-intervals-corresponding-z-scores-9611

    Solution Preview

    Solution. Assume that the standard deviation is x, by the hypothesis, we know that

    |79-65|/x=1.4, so x=10

    that is,
    the ...

    Solution Summary

    The solution answers the question(s) below.

    $2.19

    ADVERTISEMENT