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17 September, 20:27

Suppose a 90 percent confidence interval to estimate a population proportion was calculated from a sample proportion of 18 percent and a margin of error of 4 percent. What is the width of the confidence interval?

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  1. 17 September, 20:55
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    Answer: The width of the confidence interval is 8%.

    Step-by-step explanation:

    The width of the confidence interval is twice the margin of error.

    Given : A 90 percent confidence interval to estimate a population proportion was calculated from a Sample proportion = 18 %.

    Margin of error = 4 %.

    Then, the width of the confidence interval = 2 x (Margin of error)

    = 2 x (4%)

    = 8%

    Hence, the width of the confidence interval is 8%.
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