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    dcuffee's Avatar
    dcuffee Posts: 1, Reputation: 1
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    #1

    Sep 26, 2010, 05:29 PM
    Find the margin of error given 99% confidence interval; n = 201; x = 270; s = 42.
    Find the margin of error given 99% confidence interval; n = 201; x = 270; s = 42.
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Sep 28, 2010, 05:51 AM



    The z score for a 99% CI is 2.575

    Just sub in your knowns given.

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