Suppose a presidential candidate wants to compare the preferences of registered voters in the northeastern United States
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Question:
Suppose a presidential candidate wants to compare the preferences of registered voters in the northeastern United States with those in the southeastern United States. Such a comparison would help determine where to concentrate campaign efforts. The candidate hires a professional pollster to randomly choose 1,500 registered voters in the northeast and 2,000 in the southeast and interview each to learn of her or his voting preference. Construct a 95% confidence interval for the difference between population proportion of voters in Northeast and the population proportion of voters in Southeast.
Results of Poll | |
Northeast | Southeast |
n1 = 1,500 | n2 = 2,000 |
x1 = 546 | x2 = 475 |
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