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    Question

    A random sample of 100 ball bearings selected from a

    shipment of 2000 ball bearing has an average diameter of 0.354 inches with standard deviation 0.048 inches. The 95% confidence interval for the average diameter of these 2000 ball bearings is:
    A 0.354 ┬▒ 1.96 ├Ч 0.048 Correct Answer Incorrect Answer
    B 0.354 ┬▒ 1.96 ├Ч 0.0047 Correct Answer Incorrect Answer
    C 0.354 ┬▒ 0.048 Correct Answer Incorrect Answer
    D 0.048 ┬▒ 1.96 ├Ч 0.354 Correct Answer Incorrect Answer

    Solution

    The correct answer is B

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