# prac1_b - STA 3024 Practice Exam 1 1 Consider the...

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STA 3024 Practice Exam 1 1. Consider the conditional distribution in the following contingency table: Result Medication Cured Not cured Total Medication I 81% 19% 100% Medication II 66% 34% 100% True or false: In this sample, 81% of patients who were cured took Medication I. (A) True (B) False 2. We are investigating whether the presence of a certain disease is related to blood type. Suppose we could calculate the conditional distribution of disease status given blood type for the entire population . In which of the following two situations would the population conditional distribution indicate that disease status and blood type are independent? Disease Status Blood Type Present Absent AB 50% 50% A 0% 100% B 50% 50% O 0% 100% Situation I Disease Status Blood Type Present Absent AB 6% 95% A 4% 96% B 3% 97% O 1% 99% Situation II (A) Situation I only (B) Situation II only (C) both Situation I and Situation II (D) neither Situation I nor Situation II 3. 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.) Response Gender Yes No Male 14 7 Female 7 14 Table I Response Gender Yes No Male 7 14 Female 14 7 Table 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.

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4. A researcher conducts a chi-squared test for a contingency table with three rows. (She forgets to tell us how many columns.) She reports a test statistic value of X 2 = 15 . 31 and a p-value of 0.053. 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. 5. What value of the relative risk would represent the same strength of association as a relative risk of 4.0? (A) - 4 . 0 (B) - 3 . 0 (C) - 0 . 25 (D) - 0 . 25 (E) - 0 . 45 6. A chi-squared test for a contingency table with two rows and two columns yields a test statistic value of X 2 = 9 . 45. The p-value of the test is (A) less than 0.001. (B) between 0.001 and 0.005.
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prac1_b - STA 3024 Practice Exam 1 1 Consider the...

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