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Wgu d514 analytical methods of health care EXAM 2026-2027
BANK QUESTIONS WITH DETAILED VERIFIED ANSWERS
EXAM QUESTIONS WILL COME FROM HERE (100%
CORRECT ANSWERS A+ GRADED
1. A researcher is designing a study to investigate the relationship
between a high-fat diet and cardiovascular disease. The study will
follow participants over 20 years, collecting dietary data and health
outcomes. What type of study design is this?
A. Cross-sectional study
B. Case-control study
C. Prospective cohort study
D. Randomized controlled trial
Answer: C. A prospective cohort study follows a group of individuals
forward in time to see if exposure status affects the development of an
outcome. Here, participants are followed for 20 years, making it
prospective.
2. In a research study, the variable that is manipulated by the
researcher to observe its effect is known as the:
A. Confounding variable
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B. Dependent variable
C. Independent variable
D. Control variable
Answer: C. The independent variable is the factor that is intentionally
changed or manipulated to determine its influence on the dependent
variable.
3. A hospital administrator wants to understand the average length of
stay for all patients discharged with pneumonia in the year 2023.
Calculating the sum of all lengths of stay divided by the number of
patients yields which measure?
A. Median
B. Mode
C. Mean
D. Range
Answer: C. The mean is the arithmetic average, calculated by summing
all values and dividing by the total number of observations.
4. A study finds a correlation coefficient of r = -0.85 between hours of
exercise per week and body fat percentage. What does this indicate?
A. A weak negative linear relationship
B. A strong negative linear relationship
C. No linear relationship
D. A strong positive linear relationship
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Answer: B. An r value of -0.85 is close to -1, indicating a strong inverse
relationship; as exercise hours increase, body fat percentage tends to
decrease substantially.
5. Which measure of central tendency is most appropriate for a dataset
containing the lengths of stay for surgical patients when the data is
heavily skewed by a few very long hospitalizations?
A. Mean
B. Median
C. Mode
D. Range
Answer: B. The median is the middle value and is resistant to outliers,
making it a better measure of central tendency than the mean for
skewed distributions.
6. The Institutional Review Board (IRB) primarily functions to:
A. Fund research projects
B. Design the statistical analysis plan
C. Protect the rights and welfare of human research subjects
D. Publish research findings
Answer: C. The IRB reviews research protocols to ensure ethical
standards are met and that risks to participants are minimized and
reasonable in relation to benefits.
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7. A researcher measures the blood pressure of a group of patients
three times under identical conditions and gets very similar readings
each time, but the average reading is 15 mmHg higher than their true
intra-arterial blood pressure. This measurement process can be
described as:
A. Valid and reliable
B. Not valid but reliable
C. Valid but not reliable
D. Not valid and not reliable
Answer: B. Reliability refers to the consistency of a measure (similar
readings each time). Validity refers to accuracy (how close the
measurement is to the true value). Here, the measure is consistent but
inaccurate.
8. A p-value of 0.03 in a hypothesis test comparing two treatments
means that:
A. There is a 3% probability that the null hypothesis is true
B. There is a 97% probability that the alternative hypothesis is true
C. The observed result, or a more extreme result, would occur 3% of
the time if the null hypothesis were true
D. The treatment effect is clinically significant
Answer: C. The p-value is the probability of obtaining a test statistic at
least as extreme as the one observed, assuming the null hypothesis is
true. It is not the probability that either hypothesis is true.
Wgu d514 analytical methods of health care EXAM 2026-2027
BANK QUESTIONS WITH DETAILED VERIFIED ANSWERS
EXAM QUESTIONS WILL COME FROM HERE (100%
CORRECT ANSWERS A+ GRADED
1. A researcher is designing a study to investigate the relationship
between a high-fat diet and cardiovascular disease. The study will
follow participants over 20 years, collecting dietary data and health
outcomes. What type of study design is this?
A. Cross-sectional study
B. Case-control study
C. Prospective cohort study
D. Randomized controlled trial
Answer: C. A prospective cohort study follows a group of individuals
forward in time to see if exposure status affects the development of an
outcome. Here, participants are followed for 20 years, making it
prospective.
2. In a research study, the variable that is manipulated by the
researcher to observe its effect is known as the:
A. Confounding variable
,2|Page
B. Dependent variable
C. Independent variable
D. Control variable
Answer: C. The independent variable is the factor that is intentionally
changed or manipulated to determine its influence on the dependent
variable.
3. A hospital administrator wants to understand the average length of
stay for all patients discharged with pneumonia in the year 2023.
Calculating the sum of all lengths of stay divided by the number of
patients yields which measure?
A. Median
B. Mode
C. Mean
D. Range
Answer: C. The mean is the arithmetic average, calculated by summing
all values and dividing by the total number of observations.
4. A study finds a correlation coefficient of r = -0.85 between hours of
exercise per week and body fat percentage. What does this indicate?
A. A weak negative linear relationship
B. A strong negative linear relationship
C. No linear relationship
D. A strong positive linear relationship
,3|Page
Answer: B. An r value of -0.85 is close to -1, indicating a strong inverse
relationship; as exercise hours increase, body fat percentage tends to
decrease substantially.
5. Which measure of central tendency is most appropriate for a dataset
containing the lengths of stay for surgical patients when the data is
heavily skewed by a few very long hospitalizations?
A. Mean
B. Median
C. Mode
D. Range
Answer: B. The median is the middle value and is resistant to outliers,
making it a better measure of central tendency than the mean for
skewed distributions.
6. The Institutional Review Board (IRB) primarily functions to:
A. Fund research projects
B. Design the statistical analysis plan
C. Protect the rights and welfare of human research subjects
D. Publish research findings
Answer: C. The IRB reviews research protocols to ensure ethical
standards are met and that risks to participants are minimized and
reasonable in relation to benefits.
, 4|Page
7. A researcher measures the blood pressure of a group of patients
three times under identical conditions and gets very similar readings
each time, but the average reading is 15 mmHg higher than their true
intra-arterial blood pressure. This measurement process can be
described as:
A. Valid and reliable
B. Not valid but reliable
C. Valid but not reliable
D. Not valid and not reliable
Answer: B. Reliability refers to the consistency of a measure (similar
readings each time). Validity refers to accuracy (how close the
measurement is to the true value). Here, the measure is consistent but
inaccurate.
8. A p-value of 0.03 in a hypothesis test comparing two treatments
means that:
A. There is a 3% probability that the null hypothesis is true
B. There is a 97% probability that the alternative hypothesis is true
C. The observed result, or a more extreme result, would occur 3% of
the time if the null hypothesis were true
D. The treatment effect is clinically significant
Answer: C. The p-value is the probability of obtaining a test statistic at
least as extreme as the one observed, assuming the null hypothesis is
true. It is not the probability that either hypothesis is true.
