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.