APFIVE Margin of Error for a Proportion
Which of the following would NOT reduce the margin of error in a confidence interval for a population proportion?
A
Decreasing the confidence level from 95% to 90%
B
Using stratified random sampling instead of simple random sampling
C
Using p̂ = 0.5 instead of the actual sample proportion
D
Increasing the sample size from 500 to 1000
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