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    Express the Confidence Interval in the form of xbar +-E

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    Express the Confidence Interval in the form of xbar +-E

    Given Information:

    Z interval: (291.67, 543.11)
    xbar = 417.39
    n=98

    Choose correct confidence interval:

    a) 417.39 +- 291.67
    b) 417.39+-125.72

    Why?

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    https://brainmass.com/statistics/confidence-interval/express-confidence-interval-form-xbar-30811

    Solution Preview

    Please see the attached Word document for solution and explanation.

    Solution:

    Recall the formula for finding a confidence interval:

    You can see that ...

    Solution Summary

    In this solution, we are given a confidence interval expressed as z-scores and must convert it to the form xbar +-E. Calculation details and explanation provided.

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