STA 3024 Exam 1 Sample Questions

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19. Suppose the expected counts in Contingency Table A are identical to the expected counts inContingency Table B. The data in Table A yields a sample relative risk of 3.6, while the datain Table B yields a sample relative risk of 6.2 (calculated the same way as for Table A). Whichtable would give a larger value of the test statistic X 2 in the chi-squared test?(A) Table A(B) Table B(C) The two tables would yield the same value of X 2 .20. Which of the following data sets would be most immediately suitable for representation as acontingency table?(A)Age Cola Preference(Explanatory) (Response)39 Pepsi48 Pepsi70 Coke(B)Age Cola Consumption(Explanatory) (Response)19 42 ounces/day58 0 ounces/day51 15 ounces/day..62 Coke..26 20 ounces/day(C)Time Zone(Explanatory)CentralEasternPacificCola Preference(Response)PepsiPepsiCoke(D)Time Zone(Explanatory)CentralPacificEasternCola Consumption(Response)4 ounces/day0 ounces/day15 ounces/day.Eastern.Coke.Eastern.10 ounces/day21. A random sample of Americans is asked whether they approve or disapprove of the performanceof the President. The data is recorded in a contingency table with approve/disapprove as theresponse variable and gender as the explanatory variable. A chi-squared test on the data yieldsa p-value of 0.00004. From this, we can conclude that the percentage of all American men whoapprove(A) differs greatly from the percentage of all American women who approve.(B) differs from the percentage of all American women who approve, but we can’t concludeanything about how big the difference is.(C) differs greatly from the percentage of all American men who disapprove.(D) differs from the percentage of all American men who disapprove, but we can’t concludeanything about how big the difference is.
22. In a chi-squared test with df = 2, a test statistic value of X 2 = 4.59 corresponds to a p-value(A) between 0.010 and 0.025.(B) between 0.025 and 0.050.(C) between 0.050 and 0.100.(D) between 0.100 and 0.250.(E) larger than 0.250.23. We perform a chi-squared test with df = 3 and find a test statistic value of X 2 = 12.5. Thep-value of the test is the probability, calculated as if H 0 were true, of getting a X 2 value that is(A) greater than or equal to 12.5.(B) less than or equal to 12.5.(C) equal to 12.5.(D) between −12.5 and 12.5.(E) equal to either −12.5 or 12.5.24. A chi-squared test is conducted to determine if esophageal cancer is associated with proteinintake. The test yields a p-value of 0.37. Using a significance level of α = 0.10, we(A) reject H 0 , so we conclude that esophageal cancer depends on protein intake.(B) reject H 0 , so we conclude that it’s reasonable that esophageal cancer does not depend onprotein intake.(C) fail to reject H 0 , so we conclude that esophageal cancer depends on protein intake.(D) fail to reject H 0 , so we conclude that it’s reasonable that esophageal cancer does not dependon protein intake.25. When analyzing the strength of an association in a contingency table, a relative risk of 1.0(A) represents a stronger association than a relative risk of 0.5.(B) represents a stronger association than a relative risk of 1.7.(C) represents the same strength of association as a relative risk of 1.7.(D) corresponds to the variables being independent.(E) is impossible.26. In a chi-squared test, which of the following corresponds to a large p-value?(A) a large value of the X 2 test statistic(B) data that agrees with the null hypothesis(C) both (A) and (B)(D) neither (A) nor (B)
Page 1 and 2: STA 3024Exam 1 Sample QuestionsIn t
Page 3 and 4: 7. In a chi-squared test, which of
Page 5: 16. For the contingency table below
Page 9 and 10: 30. A researcher is conducting a ch
Page 11 and 12: 39. How does Fisher’s exact test
Page 13 and 14: 47. A company is investigating the
Page 15 and 16: 53. Consider the conditional distri
Page 17 and 18: 58. A researcher conducts a chi-squ
Page 19 and 20: 66. A previous study reported that
Page 21 and 22: 72. Suppose we want to test for ind
Page 23 and 24: 78. Suppose for simplicity that 50%
Page 25 and 26: 85. Suppose we’re investigating t
Page 27 and 28: 91. A study is conducted in which h
Page 29 and 30: 97. Suppose we want to test for ind
Page 31 and 32: 102. Which of the following two con
Page 33 and 34: 109. For the data shown in the foll
Page 35 and 36: Chapter 4: Nonparametric Methods113
Page 37 and 38: 119. A Mann-Whitney U test with a t
Page 39 and 40: 126. Which of the following stateme
Page 41: 135. The distribution of the test s

STA 3024 Exam 1 Sample Questions

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