Chapter 10 Quizes - . f f. ,105 .. ._ v ._...

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Unformatted text preview: . f f. ,105 .. ._ v ._ Quizl.__._AB..Statistics Name;__ _. Suppose you administer . .. rtain aptitude test to a random samle a dents in your school, and that the average score is lfi We want to dete 'ne th n the population all student in 6. @ /Q t: the test. Inggtence I. What is the upper r a 98% confidence interval? (Show the key numbers in the sketch of the distribution.) the school. ' Assume a standard deviation 0 WW (score) 2. Explain the meaning of “98% confident.” I F - I I- i i 2 we M 98% MM - 3% Wit W W 5M 024 7430’} /1 L9 [Audit/t4 M 3. Whatisthestandardd ; (Cl3g7) . -lE1§;' a] M (q. 4. I Calculate a 98% confidence interval for the mean score u for the whole school. Follow the Inference Toolbox. d196, W AQE’ifM/Ullfi‘i’W/Mflf' new $406 ® sivxflcwds M £114.9le w éij @ Sim wan M Iii—4 MWWU’ MEWMQN‘ xgw in, A warmnédflqén‘zmwe WMS‘QS’ 3. or; “gig: 10% 2,3444% :1 (magnum 69 Ldktwa.-—- saitz 5. What sample size would be needed to have a margin of error a most 4 points? yrffit ngzgoljén m27e082, 6“ “5 (/a.526'15 L f n T Quiz 10.1A Chapter 10 O uiz 10 .2A Statistics At the bake : re on work, loaves of bread are suppoed t weigh 1 pound ‘ 'th standard deviatio a 0 = 0.13 poun 3 You believe that new personnel are pro - ucing loaves that ar than 1 pound. As' supervisor of Quality Control, you want to test your hypotheses at significance level. You weigh 20 loaves and obtain a mean weight of 1.05 pounds. ._...--—"’ m Zjéfiwffii’QJfi mem 5; “mime” 7’ : 1‘ ' 5 ' 1 H0 J’fi a hm @WMWM >Hé- 2. Identify the statistical proogd/fi’r/e you shoi'ild C.- _.en; state" and verify the c nditions required for using this procedure. M 602/ M a AIM/fl -2«@% J mfgrmce, 7709 (“If 4. WM Mil/M W 5fl5mfla newly/£105; W 3/ Wm m Margfivéflm \ - ' <5< 0A; . 1. Identify the population and paramete of ' terest. State your null and alte tive hypotheses. in.” /§ % 3. Calculate the test statistic and the P-value. Illustrate using the 2; [.05—1 graph provided. 4. State your conclusions clearly in complete sentences. 051% a bad aces; 5m Pam g .0927405’. We, will Wofit’uMJ/JQMQ W Hut {7174 if .- Pifiw" \l'eq new wemlfl/flgedd 04L tr} Chapter 10 ‘Afl ] Quiz 10.2A 0J3 , ._ Q“iZ 103A .- . ..,..,,.Name.:. .1 3 . Read the brief neWSpaper article on using a depression pill to help smokers quit.‘ Depression Pill Seems to Help Smokers Quit BOSTON — Taking an antidepression medicine appears to double sm’okers’ chances of kicking the habit, a study found. The Food and Drug Administration approved the marketing of this medicine, called Zyban or bupropion, to help smokers in May. The results of several studies with the drug, including one published in today’s issue of the New England Journal of Medicine, Jere m de public then. . . The newly published study was conducted 0 _ 615 volunteer ho wanaetd to give up smoking and were not outwardly depresse. - 00 either Zyban or dummy pills for 6 weeks. A year Rig percent of those getting Zyban were still off cigarettes, compared with 12 cent in the comarison group. ! -' ‘5 .. A l. The results of this experime , ere significant at the 0!. = .05 significance level. In your opinion, are the resulgflificant? Justify Your position. Vol unwzflx in: (016’ ‘ EI gwpg (Water rev ~ f9 (1‘9 f I PM 3A :. w‘ 1 it .13 ‘ 2 2 : 2‘ 3615—9“ ' = «Ola: 2. In performing a test of significance, the rese - choose between adopting a fixed a at significance level or calculating a P—value. hich approach is taken? 1139, 5/ describe the circumstances when one should use each approach. 1. fl) ' {fig “% . I l FWJCX' M Uri/rm /cc94§uia,a‘ a“ “Malia )wD M-fl“§u%“€éf7w lure $4.9 004 We. amt EUWTEF... [)4 P213944 d -P:,000cwc9l Chapter 10 Quiz 10.3A Quiz 10.4A AP Statistics 7 Name: ' 5 An agricultural eld trial compares the yield 0&6. varieties of tomato Er commercial use. The researchers divide in half each of 10 small plots of land in different locations and plant each tomato variety on one half of each plot. After harvest, they compare the yields in pounds per plant at each ’ location. T = ‘ O 34. Assu e a popula 'on standard ' ~. 'tyAm 'etyB)giveJ'c= deviation f 0 . . W I1 e s, We want to determine if there is a difference in the mean yi our null h pothesis is that there is no difference in the mean 'elds, i.e., Hof ,u = 0. Ha: y at 0. We asked, “Is there cy/convincing evidence at th 5% sificance leve _ at the mean yield of tomatoes is different from ‘ p a 0?” A significance test to answer (“2/ and the P-value is 0.1952. 0d =_.0§_ 1. Describe what a Type I error would be in this situation. T I‘SQQLW: acme , 735m \Hu H0: =0. be 5&1 y Frat/£0005 “a CMC. JMEO WHA Liz/tan we Sinai/9 flat) 7 I iaI suspect that the large P-value is due t6 10w 3 ‘- ct a mean difference in yield of 0.5 pound per p ant at robability of a Type II error when in fact p = 0.5. alternative ,u = 0.5. 2. Calculate the probability of a Type I error for this problem. 4. If the sample size is increased to n = 25 plots of land, what will be the power against the e . j ’, alternative? .13 ( J E z a I Elm/matey '3 ‘3‘“ 053 i r): 3 a 50 Female? hive "1 . r325 ‘ at; Qui210.4A S‘gmfimffifl Ema? 2 gm?" Miami-.1“ ...
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This note was uploaded on 05/01/2011 for the course AP CLASSES 101 taught by Professor Mr.smith during the Spring '11 term at Korea Advanced Institute of Science and Technology.

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Chapter 10 Quizes - . f f. ,105 .. ._ v ._...

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