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Which of the following is true when a 95% confidence interval for a population proportion is...

Which of the following is true when a 95% confidence interval for a population proportion is changed to a 99% confidence interval, with all other parts of the interval remaining constant? Clear Detailed Work Please! Thank you for your hard work!

One of these 4 options is correct:

A. interval size increases by 4%
B. interval size decreases by 4%
C. interval size increases by 31%
D. interval size decreases by 31%
Math   Statistics-And-Probability   
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