TESTBANK FOR ESSENTIALS OF BIOSTATISTICS FOR PUBLIC HEALTH, 4TH EDITION (LISA
M. S AMAZON
,TABLE OF CONTENTS
Part I – Foundations of Biostatistics
Chapter 1
Introduction
Chapter 2
Study Designs
Chapter 3
Quantifying the Extent of Disease
Chapter 4
Summarizing Data Collected in the Sample
Chapter 5
The Role of Probability
Part II – Statistical Inference
Chapter 6
Confidence Interval Estimates
Chapter 7
Hypothesis Testing Procedures
Chapter 8
Power and Sample Size Determination
Part III – Advanced Analytical Methods
Chapter 9
Multivariable Methods
Chapter 10
Nonparametric Tests
Chapter 11
Survival Analysis
,Part IV – Modern Biostatistical Applications
Chapter 12
Data Visualization
Chapter 13
Careers in Biostatistics (New in the 4th Edition)
Practice Exam Features
✔ Comprehensive Chapter-Based Practice Questions
✔ Advanced Clinical & Public Health Scenarios
✔ Higher-Order Critical Thinking Questions
✔ Multiple-Choice Questions (A–D)
✔ Detailed Answer Rationales
✔ Public Health Application Notes
✔ Exam Success Strategies
✔ Graduate-Level Biostatistics Review
✔ Ideal for Midterms, Finals, MPH, DrPH & Public Health Certification Preparation
Chapter 1: Introduction
Biostatistics Challenge 1
A public health department is concerned about a recent increase in type 2 diabetes among adults living in a
metropolitan area. Because collecting data from every adult resident would require excessive time and
financial resources, epidemiologists randomly select 5,000 adults to estimate the prevalence of diabetes and
identify associated risk factors. Which statistical principle BEST justifies using this approach?
A. A representative sample can be used to estimate characteristics of the target population.
B. Every member of the population must be included before valid public health conclusions can be made.
C. Descriptive statistics eliminate sampling variability when estimating disease prevalence.
D. Population parameters change whenever a different sample is selected.
Correct Answer
,A. A representative sample can be used to estimate characteristics of the target population.
Rationale
A representative sample allows researchers to estimate population characteristics without studying every
individual. This approach is the foundation of inferential statistics and supports evidence-based public health
decisions.
Why Not Correct?
B. A census is often impractical because of cost and time.
C. Descriptive statistics summarize data but do not support population-level conclusions.
D. Population parameters remain fixed; only sample statistics vary.
Public Health Perspective
National health surveys commonly use representative samples to estimate disease prevalence and health
behaviors.
Exam Success Strategy
If a question involves generalizing from a sample to a population, think inferential statistics.
Biostatistics Challenge 2
A researcher calculates the mean age, median body mass index, and percentage of smokers in a study before
performing any hypothesis tests. Which statistical method is being used?
A. Inferential statistics
B. Descriptive statistics
C. Survival analysis
D. Regression analysis
Correct Answer
B. Descriptive statistics
Rationale
Descriptive statistics organize and summarize collected data using measures such as means, percentages, and
standard deviations.
Why Not Correct?
A. Inferential statistics test hypotheses or make conclusions about a population.
,C. Survival analysis examines time until an event occurs.
D. Regression analysis evaluates relationships between variables.
Public Health Perspective
Every public health report begins with descriptive statistics before advanced analyses are performed.
Exam Success Strategy
Remember: Describe first, analyze second.
Biostatistics Challenge 3
An epidemiologist defines the study population as all adults living in County X but collects data from only
1,000 randomly selected residents. The 1,000 participants represent the:
A. Population
B. Parameter
C. Sample
D. Census
Correct Answer
C. Sample
Rationale
A sample is a subset of the target population selected to represent the entire population in a study.
Why Not Correct?
A. The population includes every eligible adult in County X.
B. A parameter is a numerical value describing the entire population.
D. A census includes every member of the population.
Public Health Perspective
Most epidemiologic studies rely on samples because studying entire populations is rarely feasible.
Exam Success Strategy
Population = everyone of interest; Sample = those actually studied.
, Biostatistics Challenge 4
A researcher uses study results from 2,500 participants to conclude that a new health education program is
likely effective for adults across the state. Which branch of statistics supports this conclusion?
A. Descriptive statistics
B. Inferential statistics
C. Frequency analysis
D. Data visualization
Correct Answer
B. Inferential statistics
Rationale
Inferential statistics allow researchers to use sample data to make evidence-based conclusions about a larger
population.
Why Not Correct?
A. Descriptive statistics summarize observed data only.
C. Frequency analysis counts observations but does not support inference.
D. Graphs display information but do not produce statistical conclusions.
Public Health Perspective
Public health agencies routinely use inferential statistics to evaluate programs and interventions.
Exam Success Strategy
Keywords like estimate, predict, and generalize usually indicate inferential statistics.
Biostatistics Challenge 5
A community health survey records participants as current smokers, former smokers, or never smokers.
What type of variable is smoking status?
A. Continuous quantitative
B. Nominal categorical
C. Ordinal categorical
D. Discrete quantitative
, Correct Answer
B. Nominal categorical
Rationale
Smoking status consists of categories without a natural order, making it a nominal categorical variable.
Why Not Correct?
A. Continuous variables are measured numerically.
C. Ordinal variables have a meaningful ranking.
D. Discrete variables represent numerical counts.
Public Health Perspective
Categorical variables are commonly used to monitor health behaviors in surveillance systems.
Exam Success Strategy
Categories without ranking are nominal variables.
Biostatistics Challenge 6
Researchers report that the average systolic blood pressure in their sample is 126 mmHg. This average is
best classified as a:
A. Population parameter
B. Sample statistic
C. Population
D. Sampling frame
Correct Answer
B. Sample statistic
Rationale
A sample statistic is a numerical value calculated from sample data and is used to estimate a population
parameter.
Why Not Correct?
A. A population parameter describes the entire population.
,C. A population refers to all individuals of interest.
D. A sampling frame is the list from which participants are selected.
Public Health Perspective
Researchers frequently use sample statistics to estimate disease prevalence and health indicators.
Exam Success Strategy
If the value comes from the sample, it is a sample statistic.
Biostatistics Challenge 7
A public health investigator wants every adult in the state to have an equal chance of being selected for a
health survey. Which sampling approach BEST achieves this goal?
A. Convenience sampling
B. Voluntary response sampling
C. Simple random sampling
D. Snowball sampling
Correct Answer
C. Simple random sampling
Rationale
Simple random sampling gives every eligible individual an equal probability of selection, helping reduce
selection bias.
Why Not Correct?
A. Convenience sampling may not represent the population.
B. Volunteers often differ from non-volunteers, introducing bias.
D. Snowball sampling is useful for hard-to-reach populations but is not random.
Public Health Perspective
Random sampling improves the credibility and generalizability of public health research.
Exam Success Strategy
Equal chance of selection = simple random sampling.
, Biostatistics Challenge 8
A health researcher observes that the prevalence of obesity is higher in one community than another.
Before concluding that the difference reflects the entire population, what should the researcher do next?
A. Report the sample results only.
B. Perform inferential statistical analysis.
C. Collect data only from individuals with obesity.
D. Replace the sample with a census.
Correct Answer
B. Perform inferential statistical analysis.
Rationale
Inferential analysis helps determine whether an observed difference is likely due to chance and whether the
findings can reasonably be generalized to the target population.
Why Not Correct?
A. Reporting alone does not determine whether the difference is statistically meaningful.
C. Including only affected individuals introduces substantial bias.
D. A census is usually unnecessary when appropriate statistical methods are available.
Public Health Perspective
Statistical inference helps public health professionals distinguish meaningful findings from random variation
before making policy decisions.
Exam Success Strategy
When comparing groups and making population-level conclusions, inferential statistics is the next step after
descriptive analysis.
Biostatistics Challenge 9
A state health agency estimates the prevalence of hypertension using a simple random sample of 3,500
adults. The estimated prevalence is 28.4%, whereas the true population prevalence is unknown. Which
quantity is the 28.4% value?
A. Population parameter
B. Sample statistic
, C. Sampling frame
D. Population distribution
Correct Answer
B. Sample statistic
Rationale
A sample statistic is a numerical value calculated from a sample and is used to estimate an unknown
population parameter. Because the value was obtained from the selected participants rather than every adult
in the state, it is a sample statistic.
Why Not Correct?
A. A population parameter describes the entire population and is usually unknown.
C. A sampling frame is the list or source from which participants are selected.
D. A population distribution describes how values are distributed across the population, not a single estimate.
Public Health Perspective
Health surveys routinely report sample statistics that guide policy while acknowledging that they estimate—
not equal—the true population values.
Exam Success Strategy
If a numerical value comes from a sample, it is always a sample statistic.
Biostatistics Challenge 10
Researchers recruit participants by asking current study participants to invite friends and relatives with the
same rare neurological condition. Which concern should investigators recognize when interpreting the
findings?
A. Reduced sampling variability
B. Increased external validity
C. Increased risk of selection bias
D. Elimination of confounding
Correct Answer
C. Increased risk of selection bias
M. S AMAZON
,TABLE OF CONTENTS
Part I – Foundations of Biostatistics
Chapter 1
Introduction
Chapter 2
Study Designs
Chapter 3
Quantifying the Extent of Disease
Chapter 4
Summarizing Data Collected in the Sample
Chapter 5
The Role of Probability
Part II – Statistical Inference
Chapter 6
Confidence Interval Estimates
Chapter 7
Hypothesis Testing Procedures
Chapter 8
Power and Sample Size Determination
Part III – Advanced Analytical Methods
Chapter 9
Multivariable Methods
Chapter 10
Nonparametric Tests
Chapter 11
Survival Analysis
,Part IV – Modern Biostatistical Applications
Chapter 12
Data Visualization
Chapter 13
Careers in Biostatistics (New in the 4th Edition)
Practice Exam Features
✔ Comprehensive Chapter-Based Practice Questions
✔ Advanced Clinical & Public Health Scenarios
✔ Higher-Order Critical Thinking Questions
✔ Multiple-Choice Questions (A–D)
✔ Detailed Answer Rationales
✔ Public Health Application Notes
✔ Exam Success Strategies
✔ Graduate-Level Biostatistics Review
✔ Ideal for Midterms, Finals, MPH, DrPH & Public Health Certification Preparation
Chapter 1: Introduction
Biostatistics Challenge 1
A public health department is concerned about a recent increase in type 2 diabetes among adults living in a
metropolitan area. Because collecting data from every adult resident would require excessive time and
financial resources, epidemiologists randomly select 5,000 adults to estimate the prevalence of diabetes and
identify associated risk factors. Which statistical principle BEST justifies using this approach?
A. A representative sample can be used to estimate characteristics of the target population.
B. Every member of the population must be included before valid public health conclusions can be made.
C. Descriptive statistics eliminate sampling variability when estimating disease prevalence.
D. Population parameters change whenever a different sample is selected.
Correct Answer
,A. A representative sample can be used to estimate characteristics of the target population.
Rationale
A representative sample allows researchers to estimate population characteristics without studying every
individual. This approach is the foundation of inferential statistics and supports evidence-based public health
decisions.
Why Not Correct?
B. A census is often impractical because of cost and time.
C. Descriptive statistics summarize data but do not support population-level conclusions.
D. Population parameters remain fixed; only sample statistics vary.
Public Health Perspective
National health surveys commonly use representative samples to estimate disease prevalence and health
behaviors.
Exam Success Strategy
If a question involves generalizing from a sample to a population, think inferential statistics.
Biostatistics Challenge 2
A researcher calculates the mean age, median body mass index, and percentage of smokers in a study before
performing any hypothesis tests. Which statistical method is being used?
A. Inferential statistics
B. Descriptive statistics
C. Survival analysis
D. Regression analysis
Correct Answer
B. Descriptive statistics
Rationale
Descriptive statistics organize and summarize collected data using measures such as means, percentages, and
standard deviations.
Why Not Correct?
A. Inferential statistics test hypotheses or make conclusions about a population.
,C. Survival analysis examines time until an event occurs.
D. Regression analysis evaluates relationships between variables.
Public Health Perspective
Every public health report begins with descriptive statistics before advanced analyses are performed.
Exam Success Strategy
Remember: Describe first, analyze second.
Biostatistics Challenge 3
An epidemiologist defines the study population as all adults living in County X but collects data from only
1,000 randomly selected residents. The 1,000 participants represent the:
A. Population
B. Parameter
C. Sample
D. Census
Correct Answer
C. Sample
Rationale
A sample is a subset of the target population selected to represent the entire population in a study.
Why Not Correct?
A. The population includes every eligible adult in County X.
B. A parameter is a numerical value describing the entire population.
D. A census includes every member of the population.
Public Health Perspective
Most epidemiologic studies rely on samples because studying entire populations is rarely feasible.
Exam Success Strategy
Population = everyone of interest; Sample = those actually studied.
, Biostatistics Challenge 4
A researcher uses study results from 2,500 participants to conclude that a new health education program is
likely effective for adults across the state. Which branch of statistics supports this conclusion?
A. Descriptive statistics
B. Inferential statistics
C. Frequency analysis
D. Data visualization
Correct Answer
B. Inferential statistics
Rationale
Inferential statistics allow researchers to use sample data to make evidence-based conclusions about a larger
population.
Why Not Correct?
A. Descriptive statistics summarize observed data only.
C. Frequency analysis counts observations but does not support inference.
D. Graphs display information but do not produce statistical conclusions.
Public Health Perspective
Public health agencies routinely use inferential statistics to evaluate programs and interventions.
Exam Success Strategy
Keywords like estimate, predict, and generalize usually indicate inferential statistics.
Biostatistics Challenge 5
A community health survey records participants as current smokers, former smokers, or never smokers.
What type of variable is smoking status?
A. Continuous quantitative
B. Nominal categorical
C. Ordinal categorical
D. Discrete quantitative
, Correct Answer
B. Nominal categorical
Rationale
Smoking status consists of categories without a natural order, making it a nominal categorical variable.
Why Not Correct?
A. Continuous variables are measured numerically.
C. Ordinal variables have a meaningful ranking.
D. Discrete variables represent numerical counts.
Public Health Perspective
Categorical variables are commonly used to monitor health behaviors in surveillance systems.
Exam Success Strategy
Categories without ranking are nominal variables.
Biostatistics Challenge 6
Researchers report that the average systolic blood pressure in their sample is 126 mmHg. This average is
best classified as a:
A. Population parameter
B. Sample statistic
C. Population
D. Sampling frame
Correct Answer
B. Sample statistic
Rationale
A sample statistic is a numerical value calculated from sample data and is used to estimate a population
parameter.
Why Not Correct?
A. A population parameter describes the entire population.
,C. A population refers to all individuals of interest.
D. A sampling frame is the list from which participants are selected.
Public Health Perspective
Researchers frequently use sample statistics to estimate disease prevalence and health indicators.
Exam Success Strategy
If the value comes from the sample, it is a sample statistic.
Biostatistics Challenge 7
A public health investigator wants every adult in the state to have an equal chance of being selected for a
health survey. Which sampling approach BEST achieves this goal?
A. Convenience sampling
B. Voluntary response sampling
C. Simple random sampling
D. Snowball sampling
Correct Answer
C. Simple random sampling
Rationale
Simple random sampling gives every eligible individual an equal probability of selection, helping reduce
selection bias.
Why Not Correct?
A. Convenience sampling may not represent the population.
B. Volunteers often differ from non-volunteers, introducing bias.
D. Snowball sampling is useful for hard-to-reach populations but is not random.
Public Health Perspective
Random sampling improves the credibility and generalizability of public health research.
Exam Success Strategy
Equal chance of selection = simple random sampling.
, Biostatistics Challenge 8
A health researcher observes that the prevalence of obesity is higher in one community than another.
Before concluding that the difference reflects the entire population, what should the researcher do next?
A. Report the sample results only.
B. Perform inferential statistical analysis.
C. Collect data only from individuals with obesity.
D. Replace the sample with a census.
Correct Answer
B. Perform inferential statistical analysis.
Rationale
Inferential analysis helps determine whether an observed difference is likely due to chance and whether the
findings can reasonably be generalized to the target population.
Why Not Correct?
A. Reporting alone does not determine whether the difference is statistically meaningful.
C. Including only affected individuals introduces substantial bias.
D. A census is usually unnecessary when appropriate statistical methods are available.
Public Health Perspective
Statistical inference helps public health professionals distinguish meaningful findings from random variation
before making policy decisions.
Exam Success Strategy
When comparing groups and making population-level conclusions, inferential statistics is the next step after
descriptive analysis.
Biostatistics Challenge 9
A state health agency estimates the prevalence of hypertension using a simple random sample of 3,500
adults. The estimated prevalence is 28.4%, whereas the true population prevalence is unknown. Which
quantity is the 28.4% value?
A. Population parameter
B. Sample statistic
, C. Sampling frame
D. Population distribution
Correct Answer
B. Sample statistic
Rationale
A sample statistic is a numerical value calculated from a sample and is used to estimate an unknown
population parameter. Because the value was obtained from the selected participants rather than every adult
in the state, it is a sample statistic.
Why Not Correct?
A. A population parameter describes the entire population and is usually unknown.
C. A sampling frame is the list or source from which participants are selected.
D. A population distribution describes how values are distributed across the population, not a single estimate.
Public Health Perspective
Health surveys routinely report sample statistics that guide policy while acknowledging that they estimate—
not equal—the true population values.
Exam Success Strategy
If a numerical value comes from a sample, it is always a sample statistic.
Biostatistics Challenge 10
Researchers recruit participants by asking current study participants to invite friends and relatives with the
same rare neurological condition. Which concern should investigators recognize when interpreting the
findings?
A. Reduced sampling variability
B. Increased external validity
C. Increased risk of selection bias
D. Elimination of confounding
Correct Answer
C. Increased risk of selection bias
