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Math Help - Confidence interval.

  1. #1
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    Confidence interval.

    The owner of a petrol station wished to determine the proportion of customers who use a credit card to pay at the pump. He surveyed 200 customers and found that 120 customers use credit card to pay at the pump.Construct a 96% confidence interval for the population proportions who use a credit card to pay at the pump.

    Anyone can help me solve this question?
    Last edited by mr fantastic; July 6th 2011 at 02:49 PM. Reason: Re-titled.
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  2. #2
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    Re: Confidence interval.

    Quote Originally Posted by JWEI View Post
    The owner of a petrol station wished to determine the proportion of customers who use a credit card to pay at the pump. He surveyed 200 customers and found that 120 customers use credit card to pay at the pump.Construct a 96% confidence interval for the population proportions who use a credit card to pay at the pump.

    Anyone can help me solve this question?
    Surely your notes and/or textbook have examples to follow? What have you tried? Where are you stuck? Please be more specific in what you cannot do.
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