CPH Exam Practice Questions Study Guide
EXAM Questions and Verified Answers Latest
Update 2026
The lengths of stay for six patients were 0, 0, 1, 2, 2, and 16 days. Which
is (are) the best measure(s) to summarize these data?
A) Mean
B) Median
C) Median and SD
D) Mean and SD
E) Median and Range - ✔✔ANSW✔✔..E) Median and Range
An epidemiologist attempts to predict the weight of an elderly person
from demispan. She randomly chooses 70 elderly subjects in a particular
geographic area and records their weight and demispan measurements in
the form of (x i , y i ) for i = 1...70. Given that the value of the Pearson
correlation coefficient is zero, what can be deduced?
1) There is no relation between weight and demispan
B) There is an almost perfect relationship between weight and demispan
C) There could be some nonlinear relationship between weight and
demispan
D) There is a strong negative relationship between weight and demispan
E) All pairs of values of weight and demispan are practically identical -
✔✔ANSW✔✔..C) There could be some nonlinear relationship between
weight and demispan
Which of the following statistical tests is NOT considered a
nonparametric test?
,A) Kruskal-Wallis Test
B) Wilcoxon's rank-sum test
C) Tukey's test
D) Mann-Whitney test - ✔✔ANSW✔✔..C) Tukey's test
A researcher is designing a new questionnaire to examine patient stress
levels on a scale of 0 to 5. What type of outcome variable is being
collected?
A) Ratio
B) Nominal
C) Interval
D) Ordinal
E) Binary - ✔✔ANSW✔✔..B) Ordinal
In simple linear regression, what is a method of determining the slope
and intercept of the best-fitting line?
A) Least squares
B) R-square
C) Minimum error
D) Least Error
E) Regression - ✔✔ANSW✔✔..A) Least Squares
The sensitivity of a particular screening test for a disease is 95%, and the
specificity is 90%. Which of the following statements is most correct?
(A) Of 100 people sampled from a population with the disease, the test
will correctly detect 95 individuals as positive for the disease
(B) Of 100 people sampled from a population with the disease, the test
will correctly detect 90 individuals
(C) If a person tests positive, the probability of having the disease is 0.95
(D) If a person has the disease, there is a 5% chance that the test will be
negative
,(E) If a person does not have the disease, there is a 5% chance that the
test will be positive - ✔✔ANSW✔✔..A) Of 100 people samples from a
population with the disease, the test will correctly detect 95 individuals
as positive for the disease.
Sensitivity is the proportion of truly diseased people in the screened
population who are identified as diseased by the screening test. It is a
measure of the probability of correctly diagnosing a case or the
probability that any given case will be identified by the test (e.g., true
positives). Specificity is the proportion of truly non-diseased people who
are so identified by the screening test. It is a measure of the probability
of correctly identifying a nondiseased person with the screening test
(e.g., true negatives).
The Central Limit Theorem states that:
A) The sample mean is unbiased
B) The sample mean is approximately normal
C) The parent population of the sample distribution is normally
distributed
D) The sample SD is approximately normal
E) Both statements A) and C) can be deduced from the Central Limit
Theorem - ✔✔ANSW✔✔..B) The sample mean is approximately
normal
The Central Limit Theorem states that if the sample size is large enough,
the distribution of the
sample means can be approximated by a normal distribution, even if the
original population is not
normally distributed. In other words, the distribution of the sample
means approaches a normal distribution as the sample size increases
Assume that a researcher has measured weight in a sample of 100
overweight adults before and after a diet and exercise program
, conducted at the local health department's weekly Eat Health - Be Fit
community program.
To determine whether the mean weight decreased six weeks after the
exercise program compared to the initial baseline measures, the
researcher should:
A) Compute the correlation coefficient, r, and determine the association
between being overweight and the community program
B) Conduct a t-test for independent samples
C) Conduct a t-test for dependent samples
D) Conduct a chi-square test for association
E) Not estimate the decrease because there was no control group for the
program - ✔✔ANSW✔✔..C) Conduct a t-test for dependent samples
A t-test is a hypothesis test to compare population means and
proportions. In this case, the sample is
dependent because the tests are performed on the same individuals in the
sample.
Which of the following estimates of an odds ratio most strongly suggests
a computational error?
1) 7.8
2) 1.2
3) -0.9
4) 20.9 - ✔✔ANSW✔✔..3) -0.9
An odds ratio of -0.9 most strongly indicates a computational error
because an odds ratio is calculated using probabilities, which cannot be
negative.
EXAM Questions and Verified Answers Latest
Update 2026
The lengths of stay for six patients were 0, 0, 1, 2, 2, and 16 days. Which
is (are) the best measure(s) to summarize these data?
A) Mean
B) Median
C) Median and SD
D) Mean and SD
E) Median and Range - ✔✔ANSW✔✔..E) Median and Range
An epidemiologist attempts to predict the weight of an elderly person
from demispan. She randomly chooses 70 elderly subjects in a particular
geographic area and records their weight and demispan measurements in
the form of (x i , y i ) for i = 1...70. Given that the value of the Pearson
correlation coefficient is zero, what can be deduced?
1) There is no relation between weight and demispan
B) There is an almost perfect relationship between weight and demispan
C) There could be some nonlinear relationship between weight and
demispan
D) There is a strong negative relationship between weight and demispan
E) All pairs of values of weight and demispan are practically identical -
✔✔ANSW✔✔..C) There could be some nonlinear relationship between
weight and demispan
Which of the following statistical tests is NOT considered a
nonparametric test?
,A) Kruskal-Wallis Test
B) Wilcoxon's rank-sum test
C) Tukey's test
D) Mann-Whitney test - ✔✔ANSW✔✔..C) Tukey's test
A researcher is designing a new questionnaire to examine patient stress
levels on a scale of 0 to 5. What type of outcome variable is being
collected?
A) Ratio
B) Nominal
C) Interval
D) Ordinal
E) Binary - ✔✔ANSW✔✔..B) Ordinal
In simple linear regression, what is a method of determining the slope
and intercept of the best-fitting line?
A) Least squares
B) R-square
C) Minimum error
D) Least Error
E) Regression - ✔✔ANSW✔✔..A) Least Squares
The sensitivity of a particular screening test for a disease is 95%, and the
specificity is 90%. Which of the following statements is most correct?
(A) Of 100 people sampled from a population with the disease, the test
will correctly detect 95 individuals as positive for the disease
(B) Of 100 people sampled from a population with the disease, the test
will correctly detect 90 individuals
(C) If a person tests positive, the probability of having the disease is 0.95
(D) If a person has the disease, there is a 5% chance that the test will be
negative
,(E) If a person does not have the disease, there is a 5% chance that the
test will be positive - ✔✔ANSW✔✔..A) Of 100 people samples from a
population with the disease, the test will correctly detect 95 individuals
as positive for the disease.
Sensitivity is the proportion of truly diseased people in the screened
population who are identified as diseased by the screening test. It is a
measure of the probability of correctly diagnosing a case or the
probability that any given case will be identified by the test (e.g., true
positives). Specificity is the proportion of truly non-diseased people who
are so identified by the screening test. It is a measure of the probability
of correctly identifying a nondiseased person with the screening test
(e.g., true negatives).
The Central Limit Theorem states that:
A) The sample mean is unbiased
B) The sample mean is approximately normal
C) The parent population of the sample distribution is normally
distributed
D) The sample SD is approximately normal
E) Both statements A) and C) can be deduced from the Central Limit
Theorem - ✔✔ANSW✔✔..B) The sample mean is approximately
normal
The Central Limit Theorem states that if the sample size is large enough,
the distribution of the
sample means can be approximated by a normal distribution, even if the
original population is not
normally distributed. In other words, the distribution of the sample
means approaches a normal distribution as the sample size increases
Assume that a researcher has measured weight in a sample of 100
overweight adults before and after a diet and exercise program
, conducted at the local health department's weekly Eat Health - Be Fit
community program.
To determine whether the mean weight decreased six weeks after the
exercise program compared to the initial baseline measures, the
researcher should:
A) Compute the correlation coefficient, r, and determine the association
between being overweight and the community program
B) Conduct a t-test for independent samples
C) Conduct a t-test for dependent samples
D) Conduct a chi-square test for association
E) Not estimate the decrease because there was no control group for the
program - ✔✔ANSW✔✔..C) Conduct a t-test for dependent samples
A t-test is a hypothesis test to compare population means and
proportions. In this case, the sample is
dependent because the tests are performed on the same individuals in the
sample.
Which of the following estimates of an odds ratio most strongly suggests
a computational error?
1) 7.8
2) 1.2
3) -0.9
4) 20.9 - ✔✔ANSW✔✔..3) -0.9
An odds ratio of -0.9 most strongly indicates a computational error
because an odds ratio is calculated using probabilities, which cannot be
negative.
