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    Question

    A physical instructor claims that the mean weight of

    students in school is greater than 82 kg with standard deviation 20. If a sample of size 81 students is selected with mean weight of 90. The test statistic equals to
    A z = 3.0 Correct Answer Incorrect Answer
    B z = 3.6 Correct Answer Incorrect Answer
    C z = 3.2 Correct Answer Incorrect Answer
    D z = 2.4 Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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