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Math Help - confidence interval and test of hypothesis

  1. #1
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    confidence interval and test of hypothesis

    8) July is national Grilling Month in the united states . On July 1,2008 The Harris poll # 70 reported on a survey of Americanís grilling preferences .When asked about their favourite food prepared on a barbeque ,662 of 1250 randomly sampled democrats preferred steak. As compared to 586 of 930 randomly sampled republicans.



    a)a)give a point estimate for the proportion of all democrats who prefer steak as their favourite barbeque food .



    b)Give a point estimate for the population of all republicans who prefer steak as their favourite barbeque food .



    c)Give a point estimate for the difference between the proportions of all democrats and all republicans who prefer steak as their favourite barbeque food.



    d)Construct a 95 % confidence interval for the difference between the proportions of all democrats and all republicans who prefer steak as their favourite barbeque food
    e)Give a practical interpretation of the interval part d .



    f)Explain the meaning of the phrase 95% confident in your answer to part e.
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  2. #2
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    Quote Originally Posted by ekbio View Post
    8) July is national Grilling Month in the united states . On July 1,2008 The Harris poll # 70 reported on a survey of Americanís grilling preferences .When asked about their favourite food prepared on a barbeque ,662 of 1250 randomly sampled democrats preferred steak. As compared to 586 of 930 randomly sampled republicans.



    a)a)give a point estimate for the proportion of all democrats who prefer steak as their favourite barbeque food .



    b)Give a point estimate for the population of all republicans who prefer steak as their favourite barbeque food .



    c)Give a point estimate for the difference between the proportions of all democrats and all republicans who prefer steak as their favourite barbeque food.



    d)Construct a 95 % confidence interval for the difference between the proportions of all democrats and all republicans who prefer steak as their favourite barbeque food
    e)Give a practical interpretation of the interval part d .



    f)Explain the meaning of the phrase 95% confident in your answer to part e.
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