Title: A college alumni fund appeals for donations by phoning or emailing recent graduates. A random sample ...
Post by: emlaai on Aug 30, 2019
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
▸ (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
Title: A college alumni fund appeals for donations by phoning or emailing recent graduates. A random sample ...
Post by: mace on Aug 30, 2019
(0.40 - 0.30) ± 2.33