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Home Q & A Board Science-Related Homework Help Mathematics Statistics and Probability
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emlaai emlaai
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4 years ago
A college alumni fund appeals for donations by phoning or emailing recent graduates. A random sample of 300 alumni shows that 40% of the 150 who were contacted by telephone actually made contributions compared to only 30% of the 150 who received email requests. Which formula calculates the 98% confidence interval for the difference in the proportions of alumni who may make donations if contacted by phone or by email?

▸ (0.40 - 0.30) ± 2.33

▸ (0.40 - 0.30) ± 2.33

▸ (0.40 - 0.30) ± 2.33

▸ (0.40 - 0.30) ± 2.33

▸ (0.40 - 0.30) ± 2.33
Textbook 
Stats: Modeling the World

Stats: Modeling the World


Edition: 4th
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#1
4 years ago
(0.40 - 0.30) ± 2.33
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