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

    Jul 8, 2009, 12:18 PM
    Random sampling/Confidence intervals
    a random sample of 20 pages of an textbook was made and 60% had drawings or figures on the. Find the 95% confidence interval for the actual proportion of pages on which a drawing or figure would be found?
    galactus's Avatar
    galactus Posts: 2,271, Reputation: 282
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    #2

    Jul 8, 2009, 12:26 PM
    Use the formula

    The z score for a 95% CI is 1.96

    p=.6 and q=.4 and n=20

    Add to and subtract from the .60 to find the C.I.
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