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20B Submitted by bayarboldi@yahoo.com on 3/24/2012 10:17:44 PM Points Awarded 14 Points Missed 0 piece 100% younger heap use online instant pass on (IM) more(prenominal) than hardenings than older people. A random sample of IM users establish that 73 of the 158 people in the sample aged 18 to 27 said they used IM more a lot than email. In the 28 to 39 age group, 26 of 143 people used IM more often than email. gain a 95% combine musical breakup for the difference amidst the proportions of IM users in these age groups who use IM more often than email. Follow the four-step serve well as illustrated in Examples 20.1 and 20.2. 1. realm: Among IM users, how large is the difference between the proportions of 18-to-27-year-olds and 28-to-39-year-olds who use IM more often than email? PLAN: permit p1 (for 18-to-27-year-olds) and p2 (for 28-to-39-year-olds) be these proportions. Describe the syllabus of your inference. A.Compute 95% authorization inter vals for p1 and for p2. B.Compute a 95% corporate trust interval for p1 / p2. C.Compute a 95% bureau interval for pˆ1 ? pˆ2. D.Compute a 95% confidence interval for p1 ? p2. We give a 95% confidence interval for p1 ? p2. overcompensate Points earn:1/1 naturalize Answer:D Your Response:D 2. discharge: Do the samples satisfy the conditions for victimisation large sample methods? A.Yes B.

No both(prenominal) of our samples satisfy the conditions for using large-sample methods. Right Points Earned:1/1 Correct Answer:A Your Response:A 3.SOLVE (continue): Give a 95% large sample confidence interval for p1 ? p2. A.0.1764 to 0.3762 B.0.1800 to 0.3804 C.0.2561 to 0.364 3 D.0.2295 to 0.3309 The sample proportion! s are pˆ1 = 73 / 158 = 0.4620 and pˆ2 = 26 / 143 =0.1818, and the 95% confidence interval is pˆ1 ? pˆ2 ± 1.96 ? pˆ1 (1 ? pˆ1) + pˆ2 (1 ? pˆ2) = 0.2802 ± 0.1002 = 0.1800 to 0.3804. 158143 Right Points Earned:1/1 Correct Answer:B Your Response:B 4.CONCLUDE: straight or False: The proportion of younger IM users who...If you penury to she-bop a full essay, order it on our website: OrderEssay.net

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