Econ 41 - Final Sheet (14-17)

# Econ 41 - Final Sheet (14-17) - 14 In the context of the...

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Unformatted text preview: 14. In the context of the previous question, how big should the number of male student be so that the 68% conﬁdence internal for the proportion of male students who do not like kevin’s new hair style is [0.87, 0.93]? Va 400 {17? E; .03 , 3:136 (5)960 15.5317” 2 ‘14"? d) 100 “ 7777» e) 150 : £3 - .. n (.039 - Qtttt 15. Let now 71m = 400: The 95% conﬁdence interval for the diﬂ’erence of the true proportion of male students who do not like Kevin’s new hair and the true proportion of female students who do not like Kevin’s new hair is [83)[0'07510-125l 2:15;, , mwaoo ll .607 .‘{U :10 )9 [0059,0141] , . 9132,0267] PM: '50 ' P“ HO _0.149, —0.051] .10 : (1.th ( (\$5? 1131712,? _1... .. e) None of the above “0} .10 : .OHQ = H.131, 3.1371]? 16. Mark did the survey on the gas mileages per gallon of cars from "Boyota WW and "FORD". Among 160 cars from Boyota, the average mileage per gallon is 47 with variance 10. For 160 cars from Ford, the average gas mileage per galion is 42 with variance 20. What is the three—standard error Conﬁdence interval for the true difference in mileage per gallon between cars of Boyota and Pord? a 1301,8301] n.= 11,0 , M: L” , if: ,0 b .701,6.299] 11,117,7- Irz—vz: s )9 2 §] 51:11.0, ”L’ 5’ 5 d) [4551,5551] 5 + “551(m:)131m . N N e) one of the above 5 + i 1‘14 = [3.10] 53.1%.] \, 17. Among a random sample of 800 high school studen, t 400 are placed on fast reading program and the other 400 on intensive vocabulary memorization problem Everyone who participates in the program takes a reading comprehension test before and the after the 6 month of program. For each person, the amount of score increase after program is recorded. The sample mean and sample standard deviation of the amount of score increase for the group who took the fast reading program is 10 and 6 and for the other group who took the intensive vocabulary memorization coruse is 8 and 7. The standard error for the diiference of the score increase means between the two groups is: as readmg R =10 , s '7 b , h'- “00 uocnbufan/ Sq —. ‘8 , Q'— 7 , new“) 56 ea S’s-5:2; T1710 + 1:55 : ﬁr: “(DO ...
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