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Math Help - lower bound of proportion, need lots of help with this one

  1. #1
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    Question lower bound of proportion, need lots of help with this one

    For a sample of n=60, proportion p=0.5, and at a 95% confidence level, the lower bound of the proportion is ____.

    95%, A=0.475
    P=0.35
    N=60
    C=0.95, A=0475 which corresponds to z=1.65
    SE= squr(0.35)(0.70)/60=0.0690
    E=(1.65)(0.0690)=0.11385 or 0.121

    0.121 is my answer but I'm not sure if I have set up the problem right. Thanks checking, list of possible answers are -

    1. 0.229
    2. 0.121
    3. 0.175
    4. 0.414
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  2. #2
    Eater of Worlds
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    I'm not sure what you're doing but I think there's some errors somewhere.

    Is this a confidence interval for proportions?.

    60*(0.5)=30. What does the .35 represent?.

    E=z\sqrt{\frac{pq}{n}}

    1.96 corresponds to a 95% CI, not 1.65. 1.65 is more for a 90% CI.

    But then again, I'm not sure I follow.
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