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    Question

    The statement "results are accurate within +/-4 p.p.,

    95% of the time" refers respectively to:
    A margin of error and accuracy level Correct Answer Incorrect Answer
    B confidence interval and accuracy level Correct Answer Incorrect Answer
    C margin of error and margin of confidence Correct Answer Incorrect Answer
    D confidence interval and confidence level Correct Answer Incorrect Answer
    E sample interval and confidence level Correct Answer Incorrect Answer

    Solution

    A confidence interval is a range of values that is likely to contain an unknown population parameter. If you draw a random sample many times, a certain percentage of the confidence intervals will contain the population mean. This percentage is the confidence level. In the above statement, 95% represents the confidence level which means that it can be said with 95% certainty that the confidence interval (here +/- 4pp) calculated contains the true population mean.

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