Using an ? = 0.04 a confidence interval for a population proportion is determined to be 0.65 to 0.75 . If the level of significance is decreased, the interval for the population proportion
a. becomes narrower.
b. becomes wider.
c. does not change.
d. remains the same.
b
RATIONALE: If the level of significance is decreased, the interval for the population proportion becomes wider. Decreasing a is equivalent to increasing the confidence level. Higher confidence yields wider intervals.
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