1.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.
Pati ent
BMI
(kg/m2)
Hypertensi on (Y/N)
Diabet es Type
II
(Y/N)
Smoking status (Never, Quit, Social, Current)
Educat ion Status (<High
, High,
>High)
Alcoh ol (>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
Describe the following in reference to their status as a variable, observation, or value: column 3, row 5, column 3/row 2, column 9.
Are any of the variables included in the study ordinal? If so, identify the ordinal variables
2.
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
3.
A surveyor wants to sample a city for the local Public Health Office in
order to assess asthma rates annually. In order to get the best estimate for
the project, the surveyor first decides to sample 2 of 15 census tracts, and
then to sample 5 households from each tract.
Assume there are only 10 households in each tract. The surveyor randomly
assigns each tract in the city a number 01-15, and each household in each tract
a number 01-10. Use
the following random number table
to select each tract, and then each household, continuing along the line.
058791 211403 098746 170528
086401 370614 097810 036418 340514
A) What kind of sampling
strategy is this?
B) Which census tracts and
households will be selected
4. Investigators are interested in the relationship between sleep apnea
and Alzheimer’s disease. In order
to more thoroughly understand the relationship, these investigators decide to recruit 50 participants with
Alzheimer’s and 50 participants without Alzheimer’s, and look at their history
of sleep apnea.
A) What type of study design is this?
B) What are the explanatory and
response variables?
5.
The following measurements
represent the systolic and diastolic blood pressures (mm HG) for a group of
individuals awaiting confirmation for enrollment in a study investigating the
efficacy of a new anti-hypertensive medication.
SYSBP
DIASBP
118
73
132
81
147
87
145
91
129
73
126
81
132
83
156
97
164
102
162
101
167
103
121
78
A) Create a stem-and-leaf plot
for both systolic and diastolic blood pressure.
B) Suppose that Hypertension is
categorized by a Systolic blood pressure above 159 mm HG or a diastolic blood pressure above 99 mm HG.
What is the relative frequency of the potential participants with hypertension?
