10 Sep DSRT 734 Assignment 1 – Due Sunday September 6th at 11:59
DSRT 734
Assignment 1 – Due Sunday September 6th at 11:59
Instructor: Charles Edeki
Submit the assignment in the Assignment 1 drop box.
Total points is 12.
Student Name: Date:
1. A researcher is looking at the relationship between periodontal disease and hypertension in a population of men and women. He/she decides to collect relevant information on the following variables as potential confounders in the investigation: gender (M/F), education status (<High School, High School, >High School), annual income ($), health status (dissatisfied, somewhat dissatisfied, somewhat satisfied, satisfied), Body Mass Index (weight kg/height m2). Describe each of the relevant co-variables as ordinal, categorical, or quantitative
2. Suppose a researcher conducts an analysis of the relationship between cardiovascular disease and type II diabetes. The basic summary of the findings are presented in the following table.
|
Patient |
BMI (kg/m2) |
Hypertension (Y/N) |
Diabetes Type II (Y/N) |
Smoking status (Never, Quit, Social, Current) |
Education Status (<High, High, >High) |
Alcohol (>2 drinks a day? Y/N) |
Religious Background (Catholic, Jewish, Muslim, Other) |
Ethnicity (AA, W, A, H, Other) |
|
A |
27 |
N |
N |
Current |
<High |
Y |
Catholic |
AA |
|
B |
34 |
Y |
Y |
Never |
>High |
Y |
Other |
A |
|
C |
21 |
N |
N |
Quit |
High |
Y |
Other |
W |
|
D |
28 |
Y |
N |
Social |
>High |
N |
Muslim |
W |
|
E |
36 |
Y |
Y |
Current |
<High |
Y |
Jewish |
W |
A) Describe the following in reference to their status as a variable, observation, or value: column 3, row 5, column 3/row 2, column 9.
B) Are any of the variables included in the study ordinal? If so, identify the ordinal variables.
3. Suppose a researcher conducts an experiment to assess the measuring capabilities of a new device aimed at detecting the boiling point of a chemical. The chemical has a known boiling point of 120 degrees Fahrenheit. His measurement device is tested 10 times, and results in the following measurements for boiling point. What can we say about the device with regards to its precision, accuracy, and potential bias?
|
Measurement |
Boiling Point (degrees Fahrenheit) |
|
1 |
129 |
|
2 |
137 |
|
3 |
136 |
|
4 |
141 |
|
5 |
139 |
|
6 |
142 |
|
7 |
136 |
|
8 |
127 |
|
9 |
143 |
|
10 |
123 |
4. Suppose a researcher is investigating the measurement ability of a new device intended to read the freezing point of a chemical compound. The substance used in the investigation has a known freezing point of -24 degrees Celsius. The researcher conducted a series of 10 sample measurements of the freezing point, and the results are represented below. What can we say about the device with regards to its precision, and potential bias?
|
Measurement |
Freezing Point (degrees Celsius) |
|
1 |
-26 |
|
2 |
-18 |
|
3 |
-32 |
|
4 |
-31 |
|
5 |
-24 |
|
6 |
-24 |
|
7 |
-24 |
|
8 |
-24 |
|
9 |
-11 |
|
10 |
-37 |
5. A researcher is investigating a new screening tool that is intended to help prevent the onset of breast cancer in young women. Suppose he tests the new device on a group of 10 women. The following table shows the test result and true breast cancer status of each of the women. What can we say about the new device with regards to its accuracy?
|
Patient |
Test Result |
True Cancer Status |
|
A |
+ |
+ |
|
B |
+ |
+ |
|
C |
+ |
– |
|
D |
+ |
– |
|
E |
– |
+ |
|
F |
– |
+ |
|
G |
+ |
– |
|
H |
– |
+ |
|
I |
– |
– |
|
J |
+ |
–
|
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