8. Two randomized, double-blind studies (Study X and Study Y) are conducted to assess the efficacy of a new chemotherapeutic agent. For each study, patients are randomized to receive either placebo or the new experimental chemotherapy, all subjects are then followed for a mean of 5 years. Follow-up rates are 92% in Study X and 91% in Study Y. Results show 84 Study X Study Y ETITI Lower socioeconomic Average age (years) Caucasian (%) Experiment 53 Control Experiment 52 50 84 89 Current smoker (%) 15 14 14 Control 52 86 13 25 28 30 27 Local cancer (%) Heart disease (%) Diabetes (%) 75 77 72 10 12 10 74 10 15 7 10 9 status (%) The relative risk of dying of cancer is 0.7 in Study X (95% confidence interval of 0.2 to 2.4) and 0.6 in Study Y (95% confidence interval of 0.5 to 0.7). Which of the following best accounts for this difference in confidence intervals? A) Bias B) Difference in follow-up rates C) Difference in number of patients D) Different population E) Randomization error
8. Two randomized, double-blind studies (Study X and Study Y) are conducted to assess the efficacy of a new chemotherapeutic agent. For each study, patients are randomized to receive either placebo or the new experimental chemotherapy, all subjects are then followed for a mean of 5 years. Follow-up rates are 92% in Study X and 91% in Study Y. Results show 84 Study X Study Y ETITI Lower socioeconomic Average age (years) Caucasian (%) Experiment 53 Control Experiment 52 50 84 89 Current smoker (%) 15 14 14 Control 52 86 13 25 28 30 27 Local cancer (%) Heart disease (%) Diabetes (%) 75 77 72 10 12 10 74 10 15 7 10 9 status (%) The relative risk of dying of cancer is 0.7 in Study X (95% confidence interval of 0.2 to 2.4) and 0.6 in Study Y (95% confidence interval of 0.5 to 0.7). Which of the following best accounts for this difference in confidence intervals? A) Bias B) Difference in follow-up rates C) Difference in number of patients D) Different population E) Randomization error
College Algebra (MindTap Course List)
12th Edition
ISBN:9781305652231
Author:R. David Gustafson, Jeff Hughes
Publisher:R. David Gustafson, Jeff Hughes
Chapter8: Sequences, Series, And Probability
Section8.7: Probability
Problem 58E: What is meant by the sample space of an experiment?
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