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    Comparison Distribution for Sample Scores

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    Based on the information given for each of the following studies, decide whether to reject the null hypothesis. For each, give the Z-score cutoff (or cutoffs) on the comparison distribution at which the null hypothesis should be rejected, the Z score on the comparison distribution for the sample score, and your conclusion. Assume that all populations are normally distributed.

    Study Population Sample Score p Tails of Test
    u s
    A 5 1 7 .051 (high predicted)
    B 5 1 7 .052
    C 5 1 7 .011 (high predicted)
    D 5 1 7 .012

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    Solution Preview

    For Study A:
    z -score = (7 - 5)/1 = 2
    At .05 significance level, the z-score is +1.64
    Z-score cut-off value = +1.64
    Since 2 > 1.64 so reject Null hypothesis.

    For Study ...

    Solution Summary

    The solution examines comparison distribution for sample scores. Z-score cutoffs are determined.