WGU C784 — Applied Healthcare Statistics | Objective Assessment 1 (OA #1) 2026/2027 Updated | 100% Verified Solutions
WGU C784 — Applied Healthcare Statistics | Objective
Assessment 1 (OA #1)
2026/2027 Updated | Brand New Actual Exam Questions with 100% Verified Solutions
Guaranteed Value | Comprehensive 85-Question Exam Aligned to C784 Competencies
Exam Specifications: Exactly 85 questions across 11 sections | 30% recall (definitions, formulas, terminology), 50%
application (calculations, interpretation, problem-solving), 20% analysis (study design critique, results interpretation,
clinical decision-making) | 60% calculation/application, 40% conceptual/interpretation. Each item includes four
options (A–D), one correct answer marked [CORRECT], and a detailed rationale with step-by-step statistical
reasoning, healthcare application, and OA #1 success strategy notes.
Section 1: Introduction to Statistics, Data Types, and Levels of Measurement
Questions Q1–Q9 | Focus: Descriptive vs. Inferential Statistics, Variable Types, and Levels of Measurement
Q1: A hospital quality team summarizes 30-day readmission rates for patients with heart failure over the past
year and presents them as a percentage per quarter. Which branch of statistics does this activity BEST
represent?
A. Descriptive statistics, because the team is summarizing and organizing data already collected without
making inferences beyond the sample. [CORRECT]
B. Inferential statistics, because the team is making predictions about future readmissions.
C. Bayesian statistics, because prior probabilities are being updated.
D. Nonparametric statistics, because the data are categorical.
Correct Answer: A
Rationale: Descriptive statistics summarize and organize data (e.g., rates, means, graphs) without making inferences beyond
the observed sample. Inferential statistics would use the data to draw conclusions about a larger population. Bayesian and
nonparametric methods are subtypes of inferential methods and do not apply to a pure summary of observed data.
Q2: A researcher uses a sample of 200 patients to estimate the average length of stay for all pneumonia
admissions in a health system. Which branch of statistics is being applied?
A. Inferential statistics, because a sample is used to generalize to a population parameter. [CORRECT]
B. Descriptive statistics, because the sample is being summarized.
C. Probability theory, because averages are computed.
D. Data visualization, because results are displayed.
Correct Answer: A
Rationale: Using a sample statistic (sample mean length of stay) to estimate a population parameter (system-wide mean) is
the definition of inferential statistics. Descriptive statistics would only summarize the 200 patients without generalizing.
Probability and visualization are tools, not the branch being applied.
Q3: Which of the following variables is BEST classified as quantitative and continuous?
A. Blood pressure measured in mmHg. [CORRECT]
B. Number of falls per patient per month.
Comprehensive Exam | 85 Questions Page 1
,WGU C784 — Applied Healthcare Statistics | Objective Assessment 1 (OA #1) 2026/2027 Updated | 100% Verified Solutions
C. Patient satisfaction rating on a 1–5 Likert scale.
D. Hospital admission diagnosis (ICD-10 code).
Correct Answer: A
Rationale: Blood pressure in mmHg is quantitative (numeric) and continuous (can take any value within a range, including
decimals). The number of falls is quantitative but discrete (counts). Likert rating is ordinal qualitative, and ICD-10 code is
nominal qualitative.
Q4: Which variable is quantitative and discrete?
A. Number of prior surgeries a patient has undergone. [CORRECT]
B. Weight in kilograms.
C. Time from triage to provider in minutes.
D. Body temperature in Celsius.
Correct Answer: A
Rationale: Number of prior surgeries is a count (whole numbers only), making it quantitative and discrete. Weight, time,
and temperature can take any value on a continuous scale (including decimals) and are quantitative and continuous.
Q5: Blood type (A, B, AB, O) is recorded for each patient in a clinic. Which level of measurement does this
represent?
A. Nominal — categories with no inherent order. [CORRECT]
B. Ordinal — categories with a meaningful order.
C. Interval — numeric scale with equal intervals but no true zero.
D. Ratio — numeric scale with a meaningful true zero.
Correct Answer: A
Rationale: Blood type is a nominal variable: categories with no inherent ranking. Ordinal implies ordered categories,
interval requires numeric equal intervals without a true zero, and ratio requires a meaningful zero. Blood type fits none of
those higher levels.
Q6: A pain scale uses the categories 'No pain, Mild, Moderate, Severe, Very severe.' Which level of
measurement does this BEST represent?
A. Ordinal — categories with a meaningful rank but unequal or undefined spacing between levels.
[CORRECT]
B. Nominal — categories with no order.
C. Interval — equal spacing and a true zero.
D. Ratio — equal spacing and a true zero.
Correct Answer: A
Rationale: Pain categories have a meaningful order (increasing severity) but the spacing between levels is not equal or
measurable, so this is ordinal. Nominal would have no order; interval and ratio require equal numeric spacing, with ratio also
requiring a true zero.
Q7: Body temperature measured in Celsius is BEST described as which level of measurement?
Comprehensive Exam | 85 Questions Page 2
, WGU C784 — Applied Healthcare Statistics | Objective Assessment 1 (OA #1) 2026/2027 Updated | 100% Verified Solutions
A. Interval — equal intervals between values, but zero is arbitrary (0°C is not the absence of
temperature). [CORRECT]
B. Ratio — equal intervals and a true zero.
C. Ordinal — ordered categories only.
D. Nominal — unordered categories.
Correct Answer: A
Rationale: Temperature in Celsius has equal intervals between degrees but zero is arbitrary (not the absence of thermal
energy), so it is interval level. Ratio requires a true zero (e.g., Kelvin for absolute temperature). Ordinal and nominal require
categorical data and do not apply.
Q8: Which of the following variables is measured at the ratio level?
A. Length of hospital stay in days (where 0 days means no stay and 4 days is twice as long as 2 days).
[CORRECT]
B. Patient satisfaction on a 1–5 scale.
C. Eye color (brown, blue, green, hazel).
D. Calendar year of admission (2024, 2025).
Correct Answer: A
Rationale: Length of stay in days has equal intervals and a true zero (no stay), and ratios are meaningful (4 days is twice 2
days), so it is ratio level. Likert satisfaction is ordinal, eye color is nominal, and calendar year is interval (zero is arbitrary
and ratios are not meaningful).
Q9: A nurse researcher records the number of patients per shift and the average weight of patients per shift.
Which statement correctly identifies the data types?
A. Number of patients is quantitative discrete; average weight is quantitative continuous. [CORRECT]
B. Both variables are categorical.
C. Number of patients is qualitative; average weight is quantitative discrete.
D. Both variables are quantitative discrete.
Correct Answer: A
Rationale: Number of patients per shift is a count, so it is quantitative discrete. Average weight is a numeric measure that
can take any value within a range, so it is quantitative continuous. Categorical and discrete-discrete classifications misstate
one or both variables.
Section 2: Data Collection, Sampling Methods, Bias, and Study Design
Questions Q10–Q18 | Focus: Sampling Methods, Sampling Bias, and Study Designs
Q10: A researcher wants to estimate the average BMI of all adult patients in a 1,000-patient clinic. She uses a
random number generator to select 100 patients from the clinic roster, giving each patient an equal chance of
selection. Which sampling method is this?
A. Simple random sampling. [CORRECT]
B. Stratified random sampling.
C. Cluster sampling.
Comprehensive Exam | 85 Questions Page 3
WGU C784 — Applied Healthcare Statistics | Objective
Assessment 1 (OA #1)
2026/2027 Updated | Brand New Actual Exam Questions with 100% Verified Solutions
Guaranteed Value | Comprehensive 85-Question Exam Aligned to C784 Competencies
Exam Specifications: Exactly 85 questions across 11 sections | 30% recall (definitions, formulas, terminology), 50%
application (calculations, interpretation, problem-solving), 20% analysis (study design critique, results interpretation,
clinical decision-making) | 60% calculation/application, 40% conceptual/interpretation. Each item includes four
options (A–D), one correct answer marked [CORRECT], and a detailed rationale with step-by-step statistical
reasoning, healthcare application, and OA #1 success strategy notes.
Section 1: Introduction to Statistics, Data Types, and Levels of Measurement
Questions Q1–Q9 | Focus: Descriptive vs. Inferential Statistics, Variable Types, and Levels of Measurement
Q1: A hospital quality team summarizes 30-day readmission rates for patients with heart failure over the past
year and presents them as a percentage per quarter. Which branch of statistics does this activity BEST
represent?
A. Descriptive statistics, because the team is summarizing and organizing data already collected without
making inferences beyond the sample. [CORRECT]
B. Inferential statistics, because the team is making predictions about future readmissions.
C. Bayesian statistics, because prior probabilities are being updated.
D. Nonparametric statistics, because the data are categorical.
Correct Answer: A
Rationale: Descriptive statistics summarize and organize data (e.g., rates, means, graphs) without making inferences beyond
the observed sample. Inferential statistics would use the data to draw conclusions about a larger population. Bayesian and
nonparametric methods are subtypes of inferential methods and do not apply to a pure summary of observed data.
Q2: A researcher uses a sample of 200 patients to estimate the average length of stay for all pneumonia
admissions in a health system. Which branch of statistics is being applied?
A. Inferential statistics, because a sample is used to generalize to a population parameter. [CORRECT]
B. Descriptive statistics, because the sample is being summarized.
C. Probability theory, because averages are computed.
D. Data visualization, because results are displayed.
Correct Answer: A
Rationale: Using a sample statistic (sample mean length of stay) to estimate a population parameter (system-wide mean) is
the definition of inferential statistics. Descriptive statistics would only summarize the 200 patients without generalizing.
Probability and visualization are tools, not the branch being applied.
Q3: Which of the following variables is BEST classified as quantitative and continuous?
A. Blood pressure measured in mmHg. [CORRECT]
B. Number of falls per patient per month.
Comprehensive Exam | 85 Questions Page 1
,WGU C784 — Applied Healthcare Statistics | Objective Assessment 1 (OA #1) 2026/2027 Updated | 100% Verified Solutions
C. Patient satisfaction rating on a 1–5 Likert scale.
D. Hospital admission diagnosis (ICD-10 code).
Correct Answer: A
Rationale: Blood pressure in mmHg is quantitative (numeric) and continuous (can take any value within a range, including
decimals). The number of falls is quantitative but discrete (counts). Likert rating is ordinal qualitative, and ICD-10 code is
nominal qualitative.
Q4: Which variable is quantitative and discrete?
A. Number of prior surgeries a patient has undergone. [CORRECT]
B. Weight in kilograms.
C. Time from triage to provider in minutes.
D. Body temperature in Celsius.
Correct Answer: A
Rationale: Number of prior surgeries is a count (whole numbers only), making it quantitative and discrete. Weight, time,
and temperature can take any value on a continuous scale (including decimals) and are quantitative and continuous.
Q5: Blood type (A, B, AB, O) is recorded for each patient in a clinic. Which level of measurement does this
represent?
A. Nominal — categories with no inherent order. [CORRECT]
B. Ordinal — categories with a meaningful order.
C. Interval — numeric scale with equal intervals but no true zero.
D. Ratio — numeric scale with a meaningful true zero.
Correct Answer: A
Rationale: Blood type is a nominal variable: categories with no inherent ranking. Ordinal implies ordered categories,
interval requires numeric equal intervals without a true zero, and ratio requires a meaningful zero. Blood type fits none of
those higher levels.
Q6: A pain scale uses the categories 'No pain, Mild, Moderate, Severe, Very severe.' Which level of
measurement does this BEST represent?
A. Ordinal — categories with a meaningful rank but unequal or undefined spacing between levels.
[CORRECT]
B. Nominal — categories with no order.
C. Interval — equal spacing and a true zero.
D. Ratio — equal spacing and a true zero.
Correct Answer: A
Rationale: Pain categories have a meaningful order (increasing severity) but the spacing between levels is not equal or
measurable, so this is ordinal. Nominal would have no order; interval and ratio require equal numeric spacing, with ratio also
requiring a true zero.
Q7: Body temperature measured in Celsius is BEST described as which level of measurement?
Comprehensive Exam | 85 Questions Page 2
, WGU C784 — Applied Healthcare Statistics | Objective Assessment 1 (OA #1) 2026/2027 Updated | 100% Verified Solutions
A. Interval — equal intervals between values, but zero is arbitrary (0°C is not the absence of
temperature). [CORRECT]
B. Ratio — equal intervals and a true zero.
C. Ordinal — ordered categories only.
D. Nominal — unordered categories.
Correct Answer: A
Rationale: Temperature in Celsius has equal intervals between degrees but zero is arbitrary (not the absence of thermal
energy), so it is interval level. Ratio requires a true zero (e.g., Kelvin for absolute temperature). Ordinal and nominal require
categorical data and do not apply.
Q8: Which of the following variables is measured at the ratio level?
A. Length of hospital stay in days (where 0 days means no stay and 4 days is twice as long as 2 days).
[CORRECT]
B. Patient satisfaction on a 1–5 scale.
C. Eye color (brown, blue, green, hazel).
D. Calendar year of admission (2024, 2025).
Correct Answer: A
Rationale: Length of stay in days has equal intervals and a true zero (no stay), and ratios are meaningful (4 days is twice 2
days), so it is ratio level. Likert satisfaction is ordinal, eye color is nominal, and calendar year is interval (zero is arbitrary
and ratios are not meaningful).
Q9: A nurse researcher records the number of patients per shift and the average weight of patients per shift.
Which statement correctly identifies the data types?
A. Number of patients is quantitative discrete; average weight is quantitative continuous. [CORRECT]
B. Both variables are categorical.
C. Number of patients is qualitative; average weight is quantitative discrete.
D. Both variables are quantitative discrete.
Correct Answer: A
Rationale: Number of patients per shift is a count, so it is quantitative discrete. Average weight is a numeric measure that
can take any value within a range, so it is quantitative continuous. Categorical and discrete-discrete classifications misstate
one or both variables.
Section 2: Data Collection, Sampling Methods, Bias, and Study Design
Questions Q10–Q18 | Focus: Sampling Methods, Sampling Bias, and Study Designs
Q10: A researcher wants to estimate the average BMI of all adult patients in a 1,000-patient clinic. She uses a
random number generator to select 100 patients from the clinic roster, giving each patient an equal chance of
selection. Which sampling method is this?
A. Simple random sampling. [CORRECT]
B. Stratified random sampling.
C. Cluster sampling.
Comprehensive Exam | 85 Questions Page 3
