Question

Module 6: Problem 4 Previous Problem Problem List Next Problem (1 point) The USC Annenberg School Center for the Digital Future found that, in 2009, 30% of Americans folt uncomfortable with the lack of face-to-face contact when ordering a product online. The corresponding percentage was 23.2% in 2001. Assume the samples were independently and randomly selected and that the sample size was 2000 in both years. Find a 99% confidence interval for the difference in population proportions of those uncomfortable with lack of face-to-face contact for the two years. (Let group 1 represent 2009) Note: You can earn partial credit on this problem Preview My Answers Submit Answers You have attempted this problem o times. You have 5 attempts remaining. Email instructor Page generated at 130/2020 at 5pm COT WoW 1906-2017 tham mw_version WwW21319 version PO-2.13 The Work Project -pal Lecture 10L -.pdf 30 MacBook Pro esc 80 ODO DOO % # 3 $ 4 1 & 7 2 5 6 8 C 1 14 C D

Answer 1

P - 12 - 2212 8 = 0.30 12 = 0.232 ha 2ooo 1-2-0.99 20.0) q z = 0.005 Zo.oos = 2.58 (by a table) How. C.I. for difference in Pop. Propostions- ē (1-P) P2 (1-2) + n + 0.30X0.70 0.30-0.232 20.oos 0.232X0.768 + 2000 2000 0.38 8 0.068 + 2.58 2000 0.068 t 0.015 0.033< P - P2 20.103 Please like