Using an α = .04, a confidence interval for a population proportion is determined to be .65 to .75. For the same data, if α is decreased, the confidence interval for the population proportion
A) becomes narrower.
B) becomes wider.
C) uses a zero margin of error.
D) remains the same.

Question

Quizplus · Accepted Answer

Decreasing α (alpha) increases the confidence level, which in turn increases the margin of error, making the confidence interval wider.