Econ 41 - Final Sheet (18-20)

# Econ 41 - Final Sheet (18-20) - 51 a igm bllo Jc{JV—5 d...

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Unformatted text preview: 51* a) igm bllo Jc) {JV—5 d) 210m e) None of the above 18. Tina did the survey with the size 11 about whether college students can swim in the water or not. The survey shows that a sample proportion of only 50% of college student can swim in the water. How big was 11 if a 95.4% conﬁdence interval for the population proportion of college students who know how to swim ? IV hasiflggslgl 0.08. “:1: 6.- 0.03/13Jlﬁ‘l A = .50 ’ CL: .50 b) 700 9_ M - [3.90)] 15/“, JGl/S-QB 0111' = .15 x .. /m _ dT 815 e) None of the above VL= 19/202,)?” = bl?) 19. Kevin wants to ﬁnd out the distribution of the students who run in the morning everyday. His survey says among a random sample of 350 students, only 35 students run every morning. Then, with 841% conﬁdence, the true proportion of students who run in the morning is below what number? gnaw”? wage. a: 39/250? *0 b)0.35+ ”\$239 2" "00 @310 + was-9 annoys; Ida/0.10 + 350 e) None of the above 20. A sample of 20 students in econ 41 class were taken, and they were asked whether or not they usually study at the Powell library. The responses of these students are given below, where yes indicates they usually study at the Powell library and no means they do not. Yes Yes No Yes No No No No Yes No Yes Yes No Yes No Yes No No No No What is 99% conﬁdence interval for the proportion of all econ 41 students who usually study at the Powell library. was: 1-}: 3/29 = .Lio , 3L: ,co , at 133, HO ’1 (”El (Pg) WE“ '35 2.00 M01 .185 p» [amblﬁﬂ ...
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