UT Dallas STAT 3332 - Practice Quiz 6 (F17) (2 pages)

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Practice Quiz 6 (F17)



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Practice Quiz 6 (F17)

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Pages:
2
School:
University of Texas at Dallas
Course:
Stat 3332 - Statistics for Life Sciences

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STAT 2332 001 Introductory Statistics for Life Sciences Fall 2017 Quiz 6 Test Form A NOTE Select the best answer and record it on the scantron form No credit will be given if an answer is not recorded properly on the scantron form Each question is worth 10 points 1 A study examined gallbladder function by measuring the gallbladder ejection fraction GBEF before and after fundoplication a surgery used to stop stomach contents from flowing back into the esophagus in 12 patients with acid reflux disease Following are the summary statistics for GBEF before and after fundoplication and their differences Mean SD before x 39 30 after y 57 28 Difference d y x 18 33 To test whether fundoplication increases average GBEF the appropriate null and alternative hypotheses are A versus B versus C versus D versus 2 Continuation The appropriate test statistic is A B C D 3 Continuation The distribution of the above test statistic under H0 is A N 0 1 B where is Satterthwaites degree of freedom C t11 D t38 4 Is Wheaties a power breakfast A study is conducted in an elementary statistics class with 499 and 249 students randomized to the treatment Wheaties and control Sugar Pops groups respectively after the midterm Final scores averaged 66 for the treatment group with SD of 21 For the control group mean and SD were 59 and 20 respectively An appropriate test statistic and its distribution under H0 is A where is Satterthwaites degree of freedom B C where 499 249 2 D 5 One study of grand juries in Alameda County California compared the demographic characteristics of jurors with the general population to see if the jury panel were representative The results for age are shown below The investigators wanted to know whether these 66 jurors were selected at random from the population of Alameda County Age County wide percentage Observed jurors 21 to 40 42 41 50 23 51 60 16 60 19 Total 100 5 9 19 33 66 What is the null hypothesis for this test A The jurors for the four age groups in order are



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