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Math Help - Statistics

  1. #1
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    Statistics

    What proportion of pizza restaurants that are primarily fro walk-in business have a salad bar? Suppose that, in an effort to determine this figure, a random sample of 1,250 of these restaurants across the United States base on the Yellow Pages is called. If 975 of the restaurants sampled have a salad bar, what is the 98% confidence interval for the population proportion? State what the confidence interval means.
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  2. #2
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    Quote Originally Posted by blierk1 View Post
    What proportion of pizza restaurants that are primarily fro walk-in business have a salad bar? Suppose that, in an effort to determine this figure, a random sample of 1,250 of these restaurants across the United States base on the Yellow Pages is called. If 975 of the restaurants sampled have a salad bar, what is the 98% confidence interval for the population proportion? State what the confidence interval means.
    Post #3 in this thread provides an example to follow: http://www.mathhelpforum.com/math-he...-homework.html

    Note that in your case, instead of using z_{0.05/2} = z_{0.025}= 1.96 you need to use z_{0.02/2} = z_{0.01} = \, .... where \Pr(Z > z_{0.01}) = 0.01.
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