MPH 6011 FINAL EXAM 2025. COMPLETE ACTUAL EXAM
QUESTIONS AND ANSWERS 100% CORRECT LATEST UPDATE.
T/F: In studies where the research question is looking at the cause of disease, either a
representative sample or a purposive sample can be used. - C O R R E C T - true
A simple random sample has certain assumptions. Which of the options below is an
assumption underlying a simple random sample (Select all that apply)?
a. The probability of being selected is based on having specific characteristics
b. Selection into sample is independent between each member
c. The prevalence of health indicators will always be at least 25%
d. Probability of selection is the same for everyone- C O R R E C T - b. Selection
into sample is independent between each member
d. Probability of selection is the same for everyone
The mean blood pressure in a sample of people from a population is 110 over 70. For
the sample to be representative of the overall population, the overall population mean
would have to be: - C O R R E C T - Similar to 110 over 70
A design feature in experimental studies that creates equal probability in treatment
assignment is what? - C O R R E C T - randomization
T/F: One purpose of randomization is to eliminate differences in measured and
unmeasured characteristics between the treated and untreated groups in the study.
- CORRECT - true
The primary purpose of a double-blind study is to:- CORRECT - Avoid provider bias
and participant bias
Fluoride was introduced into the water supply of Town A on January 1, 2000. A study
was conducted to compare new occurrence of cavities in children ages 3-10 years living
in two towns (Town A and Town B). The towns are located 10 miles apart. New Cavities
in children were measured 5 years after fluoride was introduced into the water supply.
Fluoride in water reduced cavities. What is the best answer for the type of study design:
- CORRECT - Natural experiment
Which of the following statements is true about analytic and descriptive epidemiology
(select only one)? - C O R R E C T - Analytic epidemiology compares health
events between two or more groups to identify causes of those health events
A study on the prevalence of diabetes is conducted by randomly selecting 500 people
from Pitt County and measuring A1c levels to determine the prevalence of diabetes.
What is being described? - C O R R E C T - taking a simple random sample
, A study is conducted by recruiting 100 students aged 11-15 years old from an urban
middle school and another 100 students aged 11-15 years old from a rural middle
school. Students are randomized to one of two groups: 1) participate in an afterschool
program focusing on exercise and nutrition or 2) do their usual after school activity
whatever it may be. What is being described? - C O R R E C T - Randomization
of an intervention program
which of the following measures of association are calculated using the incidence
proportion in an exposed group and an incidence proportion in an unexposed group
(select all that apply)?
a. risk difference
b. rate difference
c. odds difference
d. risk ratio
e. rate ratio
f. odds ratio - C O R R E C T - a. risk difference
d. risk ratio
In a study, the association between smoking and coronary heart disease was
investigated by selecting for study a group of 3000 smokers and 5000 non-smokers who
were free of disease at baseline. Both groups were followed for the development of
coronary heart disease. 84 smokers developed coronary heart disease and 87
nonsmokers did too. 4913 persons did not develop disease and did not smoke. One
measure of association relating exposed to unexposed would be: - CORRECT -
(84/3000) / (87/5000)
A 20-year cohort study generated 30 cases of heart disease in exposed group and
54,308 person years. The unexposed group had 60 cases and 51,477 person-years.
The measure of association showed 0.47. The best interpretation of this finding is: -
CORRECT - The exposed group had a reduced rate of heart disease compared to
unexposed group.
T/F: Confidence intervals quantify the variability around a sample estimate-
C O R R E C T - true
Which of the following are true statements about confidence intervals (select all that
apply)?
a. Smaller samples result in more narrow confidence intervals (better precision)
b. Larger samples result in more narrow confidence intervals (better precision)
c. The upper and lower bounds of a confidence interval represent the likely range of
values for the true measure of association
d. 95% confidence intervals remove 95% of the bias in the observed measure of
association- C O R R E C T - b. larger samples result in more narrow
confidence intervals (better precision)
QUESTIONS AND ANSWERS 100% CORRECT LATEST UPDATE.
T/F: In studies where the research question is looking at the cause of disease, either a
representative sample or a purposive sample can be used. - C O R R E C T - true
A simple random sample has certain assumptions. Which of the options below is an
assumption underlying a simple random sample (Select all that apply)?
a. The probability of being selected is based on having specific characteristics
b. Selection into sample is independent between each member
c. The prevalence of health indicators will always be at least 25%
d. Probability of selection is the same for everyone- C O R R E C T - b. Selection
into sample is independent between each member
d. Probability of selection is the same for everyone
The mean blood pressure in a sample of people from a population is 110 over 70. For
the sample to be representative of the overall population, the overall population mean
would have to be: - C O R R E C T - Similar to 110 over 70
A design feature in experimental studies that creates equal probability in treatment
assignment is what? - C O R R E C T - randomization
T/F: One purpose of randomization is to eliminate differences in measured and
unmeasured characteristics between the treated and untreated groups in the study.
- CORRECT - true
The primary purpose of a double-blind study is to:- CORRECT - Avoid provider bias
and participant bias
Fluoride was introduced into the water supply of Town A on January 1, 2000. A study
was conducted to compare new occurrence of cavities in children ages 3-10 years living
in two towns (Town A and Town B). The towns are located 10 miles apart. New Cavities
in children were measured 5 years after fluoride was introduced into the water supply.
Fluoride in water reduced cavities. What is the best answer for the type of study design:
- CORRECT - Natural experiment
Which of the following statements is true about analytic and descriptive epidemiology
(select only one)? - C O R R E C T - Analytic epidemiology compares health
events between two or more groups to identify causes of those health events
A study on the prevalence of diabetes is conducted by randomly selecting 500 people
from Pitt County and measuring A1c levels to determine the prevalence of diabetes.
What is being described? - C O R R E C T - taking a simple random sample
, A study is conducted by recruiting 100 students aged 11-15 years old from an urban
middle school and another 100 students aged 11-15 years old from a rural middle
school. Students are randomized to one of two groups: 1) participate in an afterschool
program focusing on exercise and nutrition or 2) do their usual after school activity
whatever it may be. What is being described? - C O R R E C T - Randomization
of an intervention program
which of the following measures of association are calculated using the incidence
proportion in an exposed group and an incidence proportion in an unexposed group
(select all that apply)?
a. risk difference
b. rate difference
c. odds difference
d. risk ratio
e. rate ratio
f. odds ratio - C O R R E C T - a. risk difference
d. risk ratio
In a study, the association between smoking and coronary heart disease was
investigated by selecting for study a group of 3000 smokers and 5000 non-smokers who
were free of disease at baseline. Both groups were followed for the development of
coronary heart disease. 84 smokers developed coronary heart disease and 87
nonsmokers did too. 4913 persons did not develop disease and did not smoke. One
measure of association relating exposed to unexposed would be: - CORRECT -
(84/3000) / (87/5000)
A 20-year cohort study generated 30 cases of heart disease in exposed group and
54,308 person years. The unexposed group had 60 cases and 51,477 person-years.
The measure of association showed 0.47. The best interpretation of this finding is: -
CORRECT - The exposed group had a reduced rate of heart disease compared to
unexposed group.
T/F: Confidence intervals quantify the variability around a sample estimate-
C O R R E C T - true
Which of the following are true statements about confidence intervals (select all that
apply)?
a. Smaller samples result in more narrow confidence intervals (better precision)
b. Larger samples result in more narrow confidence intervals (better precision)
c. The upper and lower bounds of a confidence interval represent the likely range of
values for the true measure of association
d. 95% confidence intervals remove 95% of the bias in the observed measure of
association- C O R R E C T - b. larger samples result in more narrow
confidence intervals (better precision)
