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Thread: Confidence interval

  1. #1
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    Confidence interval

    Confidence interval-img_20171008_152756986.jpg

    I am not sure how to do question 11.
    Should I use the margin of error formula at the 95% confidence. E=1✓n

    Or should I use the standard error of the proportion formula. Standard deviation of proportion=✓[p(1-p)]/n

    Which do I use and how are you supposed to know which to use?
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  2. #2
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    Re: Confidence interval

    Quote Originally Posted by edwardkiely View Post
    Click image for larger version. 

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    I am not sure how to do question 11.
    Should I use the margin of error formula at the 95% confidence. E=1✓n
    Or should I use the standard error of the proportion formula. Standard deviation of proportion=✓[p(1-p)]/n
    Which do I use and how are you supposed to know which to use?
    Your image is too dark to be read. Please adjust.
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  3. #3
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    Re: Confidence interval

    You use the second of the methods you've listed.

    I confess I'm unfamiliar with the first method.
    Thanks from edwardkiely
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  4. #4
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    Re: Confidence interval

    how are you supposed to know which one to use do you know?
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  5. #5
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    Re: Confidence interval

    There is only one method that both romsek and I know...

    Proportion: Confidence Interval
    Last edited by SlipEternal; Oct 12th 2017 at 12:16 PM.
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