MPH501 Module 6 Quiz Latest 2020 January
MPH501 Quantitative Methods for Public Health Application
Module 6 Quiz
Question 1Some scientists believe that alcoholism is linked to social isolation. One measure of social isolation is marital status. A study of 280 adults is conducted and each participant is classified as not alcoholic, diagnosed alcoholic or undiagnosed alcoholic, and categorized by marital status. Is there significant evidence of an association? Run the appropriate test at a 5% level of significance.
|
Diagnosed |
Undiagnosed |
Not Alcoholic |
|
|
Married |
21 |
37 |
58 |
|
Not Married |
59 |
63 |
42 |
Question 2Suppose a hypertension trial is mounted and 18 participants are randomly assigned to one of the comparison treatments. Each participant takes the assigned medication and their systolic blood pressure (SBP) is recorded after 6 months on the assigned treatment. The data are as follows.
|
Standard Treatment |
Placebo |
New Treatment |
|
124 |
134 |
114 |
|
111 |
143 |
117 |
|
133 |
148 |
121 |
|
125 |
142 |
124 |
|
128 |
150 |
122 |
|
115 |
160 |
128 |
Is there a difference in mean SBP among treatments? Run the appropriate test at []=0.05.
Question 3A 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. The data are recorded as follows.
|
Change in Symptoms |
|
||||
|
Treatment |
Much Worse |
Worse |
No change |
Better |
Much Better |
|
Experimental |
10 |
17 |
35 |
28 |
10 |
|
Placebo |
12 |
25 |
42 |
12 |
9 |
Is there a difference in change in symptoms by treatment group? Run the appropriate test at a 5% level of significance.
Question 4The following data was collected in a clinical trial evaluating a new medication designed to improve wound healing in trauma patients. The new compound is compared against a placebo. After treatment for 10 days with the new compound or placebo the extent of wound healing is measured and the data are shown below.
|
Percent Wound Healing |
|
|||
|
Treatment |
0-25% |
26-50% |
51-75% |
76-100% |
|
New psoriasis medication (n=125) |
15 |
37 |
32 |
41 |
|
Placebo (n=125) |
36 |
45 |
34 |
10 |
Is there a difference in the extent of wound healing by treatment? (Hint: Are treatment and the percent wound healing independent?) Run the appropriate test at a 5% level of significance.
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