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1 June, 14:50

g Students conducted a survey and found out that 36% of their peers on campus had tattoos but only 4% of their peers were smokers. If 100 students were surveyed, can these students use the Normal approximation to construct a confidence interval for the proportion of students in the population who are smokers? No, because either n p np or n (1 - p) n (1-p) are greater than 15. Yes, because both n p np and n (1 - p) n (1-p) are greater than 15. Yes, because both n p np and n (1 - p) n (1-p) are less than 15. No, because either n p np or n (1 - p) n (1-p) are less than 15.

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  1. 1 June, 18:08
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    D) No, because either np or n (1-p) are less than 15.

    Step-by-step explanation:

    Percentage of students who had tattoos = 36%

    Percentage of students who were smokers = 4%

    Sample size = n = 100

    The condition to use the Normal distribution as an approximation to construct the confidence interval for population proportion is:

    Both np and n (1-p) must be equal to or greater than 15.

    Since, we are interested in smokers only, so p = 4% = 0.04

    np = 100 x 0.04 = 4

    n (1 - p) = 100 x 0.96 = 96

    Since, np < 15, we cannot use the Normal distribution as an approximation here.

    Therefore, the correct answer is:

    No, because either np or n (1-p) are less than 15.
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