Biostastics final exam march 2021.docx - User Course Test...

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User Adeola Adeleye Course 202120 Spring 2021 HLTH 501-B02 LUO Test Final Exam Started 3/10/21 11:48 PM Submitted 3/12/21 1:47 AM Due Date 3/12/21 11:59 PM Status Completed Attempt Score 141.3 out of 150 points Time Elapsed 25 hours, 59 minutes Instructions 44 multiple-choice, true/false, and essay questions For the essay questions, you must show your work. Just writing "significance" will not be enough Open-book/open-notes Do not hit the BACK button as this will lock you out of the exam. Results Displayed Submitted Answers, Feedback, Incorrectly Answered Questions Question 1 3.4 out of 3.4 points Considering the data blow. The median is 120. 100 120 111 115 120 116 125 129 130
Question 2 3.4 out of 3.4 points A stratified random sample can be used to ensure underrepresented populations are represented in a study.
Question 3 3.4 out of 3.4 points Considering the data blow. The mean is 118.44. 100 120 111 115 120 116 125 129 130
Question 4 3.4 out of 3.4 points When performing a Mann-Whitney U test, one should always use the higher value of the calculated U values to compare to the critical U value while making the decision rule.
Question 5 3.4 out of 3.4 points If a 95% confidence interval for the difference in two independent means is (-4.5 to 2.1), then the point estimate is -2.1.
Question 6 0 out of 3.4 points The margin of error is always greater than or equal to the standard error.
Question 7 3.4 out of 3.4 points An r value of .8 indicates a strong positive correlation.
Question 8 3.4 out of 3.4 points The sample size required to detect an effect size of 0.25 is larger than the sample size required to detect an effect size of 0.50 with 80% power and a 5% level of significance.
Question 9 3.4 out of 3.4 points Which of the following individuals is likely to be excluded from a clinical trial?
Question 10 3.4 out of 3.4 points A clinical trial is conducted to compare an experimental medication to placebo to reduce the symptoms of asthma. Two hundred participants are enrolled in the study and randomized to receive either the experimental medication or placebo. The primary outcome is self-reported reduction of symptoms. Among 100 participants who receive the experimental medication, 38 report a reduction of symptoms as compared to 21 participants of 100 assigned to placebo. When you test if there is a significant difference in the proportions of participants reporting a reduction of symptoms between the experimental and placebo groups. Use α = 0.05. What should the researcher’s conclusion be for a 5% significance level? Reject H 0 because 2.64 ≥ 1.960. We have statistically significant evidence at α = 0.05 to show that there is a difference in the proportions of patients reporting a reduction in symptoms.

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