CPH EXAM PRACTICE QUESTIONS PUBLIC HEALTH CERTIFICATION 2026
COMPLETE PRACTICE QUESTIONS WITH ANSWERS
1. The lengths of stay for six patients E) Median and Range
were 0, 0, 1, 2, 2, and 16 days. Which
is (are) the best measure(s) to summa-
rize these data?
A) Mean
B) Median
C) Median and SD
D) Mean and SD
E) Median and Range
2. An epidemiologist attempts to predict C) There could be some nonlinear relationship be-
the weight of an elderly person from tween weight and demispan
demispan. She randomly chooses 70
elderly subjects in a particular geo-
graphic 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 corre-
lation coefficient is zero, what can be
deduced?
1) There is no relation between weight
and demispan
B) There is an almost perfect relation-
ship between weight and demispan
C) There could be some nonlinear re-
lationship between weight and demis-
pan
D) There is a strong negative relation-
ship between weight and demispan
, CPH EXAM PRACTICE QUESTIONS PUBLIC HEALTH CERTIFICATION 2026
COMPLETE PRACTICE QUESTIONS WITH ANSWERS
E) All pairs of values of weight and
demispan are practically identical
3. Which of the following statistical tests C) Tukey's test
is NOT considered a nonparametric
test?
A) Kruskal-Wallis Test
B) Wilcoxon's rank-sum test
C) Tukey's test
D) Mann-Whitney test
4. A researcher is designing a new ques- B) Ordinal
tionnaire 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
5. In simple linear regression, what is a A) Least Squares
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
, CPH EXAM PRACTICE QUESTIONS PUBLIC HEALTH CERTIFICATION 2026
COMPLETE PRACTICE QUESTIONS WITH ANSWERS
6. The sensitivity of a particular screen- A) Of 100 people samples from a population with
ing test for a disease is 95%, and the the disease, the test will correctly detect 95 individ-
specificity is 90%. Which of the follow- uals as positive for the disease.
ing statements is most correct?
Sensitivity is the proportion of truly diseased peo-
(A) Of 100 people sampled from a pop- ple in the screened population who are identified
ulation with the disease, the test will as diseased by the screening test. It is a measure
correctly detect 95 individuals as posi- of the probability of correctly diagnosing a case or
tive for the disease the probability that any given case will be identified
(B) Of 100 people sampled from a pop- by the test (e.g., true positives). Specificity is the
ulation with the disease, the test will proportion of truly non-diseased people who are
correctly detect 90 individuals so identified by the screening test. It is a measure
(C) If a person tests positive, the prob- of the probability of correctly identifying a nondis-
ability of having the disease is 0.95 eased person with the screening test (e.g., true
(D) If a person has the disease, there negatives).
is a 5% chance that the test will be
negative
(E) If a person does not have the dis-
ease, there is a 5% chance that the test
will be positive
7. The Central Limit Theorem states B) The sample mean is approximately normal
that:
The Central Limit Theorem states that if the sample
A) The sample mean is unbiased size is large enough, the distribution of the
B) The sample mean is approximately sample means can be approximated by a normal
normal distribution, even if the original population is not
C) The parent population of the sam- normally distributed. In other words, the distrib-
ple distribution is normally distrib- ution of the sample means approaches a normal
uted distribution as the sample size increases
D) The sample SD is approximately
normal
, CPH EXAM PRACTICE QUESTIONS PUBLIC HEALTH CERTIFICATION 2026
COMPLETE PRACTICE QUESTIONS WITH ANSWERS
E) Both statements A) and C) can be
deduced from the Central Limit Theo-
rem
8. Assume that a researcher has mea- C) Conduct a t-test for dependent samples
sured weight in a sample of 100 over-
weight adults before and after a diet A t-test is a hypothesis test to compare population
and exercise program conducted at means and proportions. In this case, the sample is
the local health department's week- dependent because the tests are performed on the
ly Eat Health - Be Fit community pro- same individuals in the sample.
gram.
To determine whether the mean
weight decreased six weeks after the
exercise program compared to the ini-
tial baseline measures, the researcher
should:
A) Compute the correlation coeffi-
cient, r, and determine the associa-
tion between being overweight and
the community program
B) Conduct a t-test for independent
samples
C) Conduct a t-test for dependent sam-
ples
D) Conduct a chi-square test for asso-
ciation
E) Not estimate the decrease because
there was no control group for the
program
COMPLETE PRACTICE QUESTIONS WITH ANSWERS
1. The lengths of stay for six patients E) Median and Range
were 0, 0, 1, 2, 2, and 16 days. Which
is (are) the best measure(s) to summa-
rize these data?
A) Mean
B) Median
C) Median and SD
D) Mean and SD
E) Median and Range
2. An epidemiologist attempts to predict C) There could be some nonlinear relationship be-
the weight of an elderly person from tween weight and demispan
demispan. She randomly chooses 70
elderly subjects in a particular geo-
graphic 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 corre-
lation coefficient is zero, what can be
deduced?
1) There is no relation between weight
and demispan
B) There is an almost perfect relation-
ship between weight and demispan
C) There could be some nonlinear re-
lationship between weight and demis-
pan
D) There is a strong negative relation-
ship between weight and demispan
, CPH EXAM PRACTICE QUESTIONS PUBLIC HEALTH CERTIFICATION 2026
COMPLETE PRACTICE QUESTIONS WITH ANSWERS
E) All pairs of values of weight and
demispan are practically identical
3. Which of the following statistical tests C) Tukey's test
is NOT considered a nonparametric
test?
A) Kruskal-Wallis Test
B) Wilcoxon's rank-sum test
C) Tukey's test
D) Mann-Whitney test
4. A researcher is designing a new ques- B) Ordinal
tionnaire 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
5. In simple linear regression, what is a A) Least Squares
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
, CPH EXAM PRACTICE QUESTIONS PUBLIC HEALTH CERTIFICATION 2026
COMPLETE PRACTICE QUESTIONS WITH ANSWERS
6. The sensitivity of a particular screen- A) Of 100 people samples from a population with
ing test for a disease is 95%, and the the disease, the test will correctly detect 95 individ-
specificity is 90%. Which of the follow- uals as positive for the disease.
ing statements is most correct?
Sensitivity is the proportion of truly diseased peo-
(A) Of 100 people sampled from a pop- ple in the screened population who are identified
ulation with the disease, the test will as diseased by the screening test. It is a measure
correctly detect 95 individuals as posi- of the probability of correctly diagnosing a case or
tive for the disease the probability that any given case will be identified
(B) Of 100 people sampled from a pop- by the test (e.g., true positives). Specificity is the
ulation with the disease, the test will proportion of truly non-diseased people who are
correctly detect 90 individuals so identified by the screening test. It is a measure
(C) If a person tests positive, the prob- of the probability of correctly identifying a nondis-
ability of having the disease is 0.95 eased person with the screening test (e.g., true
(D) If a person has the disease, there negatives).
is a 5% chance that the test will be
negative
(E) If a person does not have the dis-
ease, there is a 5% chance that the test
will be positive
7. The Central Limit Theorem states B) The sample mean is approximately normal
that:
The Central Limit Theorem states that if the sample
A) The sample mean is unbiased size is large enough, the distribution of the
B) The sample mean is approximately sample means can be approximated by a normal
normal distribution, even if the original population is not
C) The parent population of the sam- normally distributed. In other words, the distrib-
ple distribution is normally distrib- ution of the sample means approaches a normal
uted distribution as the sample size increases
D) The sample SD is approximately
normal
, CPH EXAM PRACTICE QUESTIONS PUBLIC HEALTH CERTIFICATION 2026
COMPLETE PRACTICE QUESTIONS WITH ANSWERS
E) Both statements A) and C) can be
deduced from the Central Limit Theo-
rem
8. Assume that a researcher has mea- C) Conduct a t-test for dependent samples
sured weight in a sample of 100 over-
weight adults before and after a diet A t-test is a hypothesis test to compare population
and exercise program conducted at means and proportions. In this case, the sample is
the local health department's week- dependent because the tests are performed on the
ly Eat Health - Be Fit community pro- same individuals in the sample.
gram.
To determine whether the mean
weight decreased six weeks after the
exercise program compared to the ini-
tial baseline measures, the researcher
should:
A) Compute the correlation coeffi-
cient, r, and determine the associa-
tion between being overweight and
the community program
B) Conduct a t-test for independent
samples
C) Conduct a t-test for dependent sam-
ples
D) Conduct a chi-square test for asso-
ciation
E) Not estimate the decrease because
there was no control group for the
program
