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    Z-score of sample means

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    Compute a z statistic for each, assuming the population has a mean of 100 and a standard deviation of 20: Formula is z = (x - μ) / σ
    a. sample of 43 scores has a mean of 101: - 2.9
    b. sample of 60 scores has a mean of 96: - 1.8
    c. sample of 29 scores has a mean of 100: -3.55

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    Solution Preview

    Compute a z statistic for each, assuming the population has a mean of 100 and a standard deviation of 20: Formula is z = (x - μ) / σ
    a. sample of 43 scores has a mean of 101: - 2.9

    Solution. Let Xbar be the sample mean. Then Xbar ...

    Solution Summary

    This solution consists of details of finding the z-scores of sample means for different sample sizes.

    $2.19