Advanced Placement (AP), 21.05.2021 20:10 kimloveswim
A researcher has conducted a survey using a simple random sample of 225 elementary teachers to create a confidence interval to estimate the proportion of elementary teachers favoring the addition of a soda machine to the cafeteria. Assume that the sample proportion does not change. The researcher now decides to survey a random sample of 25 teachers instead of 225 elementary teachers. Which of the following statements best describes how the confidence interval is affected by this change?
The width of the new interval is about the same width as the original interval.
The width of the new interval is about twice the width of the original interval.
The width of the new interval is about one half the width of the original interval.
The width of the new interval is about one third the width of the original interval.
The width of the new interval is about three times the width of the original interval.
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A researcher has conducted a survey using a simple random sample of 225 elementary teachers to creat...
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