A Government Report Gives a 99% Confidence Interval for the Proportion

question 85

Multiple Choice

A government report gives a 99% confidence interval for the proportion of welfare recipients who have been receiving welfare benefits for more than 5 years to be 21% ± 4.5%.Which of the following intervals could not be a 95% confidence interval for the proportion of welfare recipients who have been receiving welfare benefits for more than 5 years?

• A)21% ± 4.2%
• B)21% ± 3.76%
• C)21% ± 3.9%
• D)21% ± 4.8%

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