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  3. in order to investigate the relationship between mean life time...

Question: in order to investigate the relationship between mean life time...

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  1. In order to investigate the relationship between mean life time in years among people who do not smoke and those who smoke regularly. Two random samples of each type of person were taken, with the following results: 

     

    n

    nar002-1.jpg

    s

    Nonsmoker

    180

    72

    7

    Smoker

    200

    63

    16


    Construct the 95% confidence interval for the difference in the population means based on these data.
    a.
    [8.80, 9.20]
    b.
    [6.56, 11.44]
    c.
    [8.43, 9.57]
    d.
    [8.32, 9.68]
    e.
    [6.95, 11.05]
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