Suppose a 95% confidence interval for a population proportion is (0.21, 0.43) . How would the width of the confidence interval change if we changed the confidence level?
A) Both a 99% confidence interval and a 90% confidence interval would be wider.
B) A 99% confidence interval would be wider and a 90% confidence interval would be narrower.
C) A 99% confidence interval would be narrower and a 90% confidence interval would be wider.
D) Both a 99% confidence interval and a 90% confidence interval would be narrower.
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