STA 3024 Exam 1 Sample Questions

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55. We are investigating whether the presence of a certain disease is related to blood type. Supposewe could calculate the conditional distribution of disease status given blood type for the entirepopulation. In which of the following two situations would the population conditional distributionindicate that disease status and blood type are independent?Disease StatusBlood Type Present AbsentAB 3% 97%A 2% 98%B 2% 98%O 1% 99%Situation IDisease StatusBlood Type Present AbsentAB 50% 50%A 0% 100%B 50% 50%O 0% 100%Situation II(A) Situation I only(B) Situation II only(C) both Situation I and Situation II(D) neither Situation I nor Situation II56. Which of the following contingency tables would yield a larger value of the X 2 test statistic?(Note: In both tables, the expected count for each cell is 8.)ResponseGender Yes NoMale 10 6Female 6 10Table IResponseGender Yes NoMale 6 10Female 10 6Table II(A) Table I(B) Table II(C) Both tables would yield the same value of X 2 .(D) We do not have enough information to answer this question.57. A contingency table for a rather large random sample is shown below, along with the conditionaldistribution of the response variable given the explanatory variable.<strong>Exam</strong> ResultBreakfast Pass FailYes 6,410 (73%) 2,324 (27%)No 2,306 (71%) 951 (29%)A chi-squared test yields a test statistic value of X 2 = 8.02 and a p-value of 0.005. Which ofthe following is true?(A) There is evidence of a strong association between exam result and breakfast.(B) There is strong evidence of an association between exam result and breakfast.(C) both (A) and (B)(D) neither (A) nor (B)
58. A researcher conducts a chi-squared test for a contingency table with three rows. (She forgetsto tell us how many columns.) She reports a test statistic value of X 2 = 15.31 and a p-value of0.053. How many columns were in her contingency table?(A) 2(B) 3(C) 4(D) 5(E) We do not have enough information to answer this question.59. What value of the relative risk would represent the same strength of association as a relativerisk of 2.20?(A) −2.20(B) −1.20(C) −0.22(D) −0.33(E) −0.4560. A chi-squared test for a contingency table yields a p-value of 0.013. Using α = 0.05, we(A) reject H 0 , and we conclude that the variables are dependent.(B) reject H 0 , and we conclude that it’s reasonable that the variables are independent.(C) fail to reject H 0 , and we conclude that the variables are dependent.(D) fail to reject H 0 , and we conclude that it’s reasonable that the variables are independent.61. A chi-squared test for a contingency table with two rows and two columns yields a test statisticvalue of X 2 = 8.86. The p-value of the test is(A) less than 0.001.(B) between 0.001 and 0.005.(C) between 0.005 and 0.010.(D) between 0.010 and 0.025.(E) between 0.025 and 0.050.62. Suppose we intend to collect data for a 3 × 3 contingency table by taking a random sample of30 subjects. Which of the following is true?(A) The chi-squared test assumes each cell’s observed count is at least 5.(B) Even before seeing the data, we already know that this sample will be too small to satisfythe assumptions of the chi-squared test.(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 and 6: 16. For the contingency table below
Page 7 and 8: 22. In a chi-squared test with df =
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: 53. Consider the conditional distri
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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