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You are studying the rate of incidence of skin cancer in people who live near the equator. Your survey of 200 people from the area has shown that 7 of them developed skin cancer.
Provide a 99% confidence interval for the true rate of incidence.

  • statistics - ,

    Example of a proportional confidence interval formula:

    CI99 = p + or - (2.58)[√(pq/n)]
    ...where p = x/n, q = 1 - p, and n = sample size.
    Note: + or - 2.58 represents 99% confidence interval.

    For p in your problem: 7/200 = .035
    For q: 1 - p = 1 - .035 = .965
    n = 200

    I let you take it from here to calculate the interval.

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