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Math Help - Confidence Intervals

  1. #1
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    Checking Confidence Intervals

    An AP Statistics teacher asks her class to construct confidence intervals given a sample proportion of .45 and a variety of sample sizes. Four groups of students are each given a different sample size and the intervals from the groups are displayed on the chalkboard. Which of the following intervals must be incorrect? Explain how you made your decision.
    Group A: (.37, .53)
    Group B: (.41, .49)
    Group C: (.35, .55)
    Group D: (.40, .49)

    All help is appreciated, thanks.
    Last edited by lancelot854; April 26th 2011 at 05:53 PM.
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  2. #2
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    Here's a hint, the sample proportion must be in the middle of the constructed interval.
    Last edited by mr fantastic; April 26th 2011 at 07:09 PM.
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  3. #3
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    Sorry again.

    The sample proportion is can be located in the middle of all of them, with the standard deviations possibly being .08, .04, .1, and .045.
    The only one that seems out of the ordinary to me is D.

    EDIT: Nevermind made a silly mistake.
    Last edited by lancelot854; April 26th 2011 at 06:58 PM.
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