The Ultimate and Complete Statistics for Nursing Research 4th Edition
Study Guide 2025, Covering Descriptive and Inferential Statistics, Data
Analysis Techniques, Probability Concepts, Hypothesis Testing, Research
Design, Evidence-Based Practice, Interpretation of Statistical Results, SPSS
Basics, Quantitative and Qualitative Research Methods, Practice Questions
with Detailed Explanations, Step-by-Step Calculations, Real Exam Scenarios,
and Proven Strategies to Successfully Master Nursing Research Statistics
and Achieve High Academic Performance
Question 1: Which level of measurement is characterized by categories that have no inherent order or
ranking?
A. Ordinal
B. Interval
C. Ratio
D. Nominal
CORRECT ANSWER: D. Nominal
RATIONALE: Nominal level of measurement involves categorizing data into mutually exclusive groups
without any intrinsic order or ranking, such as gender, blood type, or diagnosis categories.
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Question 2: A nurse researcher collects data on patient pain levels using a scale of 1 (no pain) to 10
(worst pain imaginable). This measurement scale is best classified as:
A. Nominal
B. Ordinal
C. Interval
D. Ratio
CORRECT ANSWER: B. Ordinal
RATIONALE: Pain scales using ranked categories (1-10) represent ordinal data because the numbers
indicate order but the intervals between values are not necessarily equal or measurable.
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Question 3: Which statistical measure is most appropriate for summarizing nominal level data?
A. Mean
B. Median
C. Mode
D. Standard deviation
CORRECT ANSWER: C. Mode
,RATIONALE: The mode, representing the most frequently occurring category, is the only measure of
central tendency appropriate for nominal data since mathematical operations cannot be performed on
categorical values.
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Question 4: Temperature measured in Celsius is an example of which level of measurement?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
CORRECT ANSWER: C. Interval
RATIONALE: Celsius temperature has equal intervals between values but lacks a true zero point (0°C
does not indicate absence of temperature), making it interval level data.
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Question 5: Which of the following variables represents ratio level measurement?
A. Patient satisfaction rated as low, medium, or high
B. Hospital unit type (ICU, medical, surgical)
C. Patient weight in kilograms
D. Likert scale responses from strongly disagree to strongly agree
CORRECT ANSWER: C. Patient weight in kilograms
RATIONALE: Weight in kilograms has a true zero point (0 kg indicates absence of weight) and equal
intervals, allowing for meaningful ratios (e.g., 80 kg is twice 40 kg), which defines ratio level
measurement.
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Question 6: When analyzing ordinal data, which measure of central tendency provides the most
meaningful summary?
A. Mean
B. Median
C. Mode only
D. Geometric mean
CORRECT ANSWER: B. Median
RATIONALE: The median represents the middle value in an ordered distribution and is appropriate for
ordinal data because it relies on rank order rather than equal intervals required for the mean.
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Question 7: A researcher codes marital status as 1=single, 2=married, 3=divorced, 4=widowed. What is
the highest level of measurement achieved?
,A. Nominal
B. Ordinal
C. Interval
D. Ratio
CORRECT ANSWER: A. Nominal
RATIONALE: Although numbers are assigned, marital status categories have no inherent order or equal
intervals; the numbers serve only as labels, maintaining nominal level measurement.
www.scribd.com
Question 8: Which characteristic distinguishes ratio level measurement from interval level
measurement?
A. Presence of categories
B. Equal intervals between values
C. True absolute zero point
D. Ability to rank order values
CORRECT ANSWER: C. True absolute zero point
RATIONALE: Ratio level measurement includes all properties of interval data plus a true zero point that
indicates complete absence of the attribute being measured, enabling meaningful ratio comparisons.
www.scribd.com
Question 9: In nursing research, Likert scale responses (strongly disagree to strongly agree) are
typically treated as which level of measurement for statistical analysis?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
CORRECT ANSWER: B. Ordinal
RATIONALE: Likert scales produce ordered categories where respondents indicate degree of
agreement, but the psychological distance between response options is not necessarily equal,
supporting ordinal classification.
www.scribd.com
Question 10: Which statistical test requires at least interval level data for appropriate application?
A. Chi-square test
B. Mann-Whitney U test
C. Pearson correlation coefficient
D. Spearman rank-order correlation
CORRECT ANSWER: C. Pearson correlation coefficient
, RATIONALE: The Pearson product-moment correlation coefficient assumes interval or ratio level data
with linear relationships, whereas nonparametric alternatives like Spearman correlation accommodate
ordinal data.
www.scribd.com
Question 11: A study records the number of falls per patient during hospitalization. This variable
represents which level of measurement?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
CORRECT ANSWER: D. Ratio
RATIONALE: Count data such as number of falls have a true zero (no falls), equal intervals, and allow
meaningful ratio statements (e.g., 4 falls is twice 2 falls), satisfying ratio level criteria.
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Question 12: Which statement accurately describes a limitation of nominal level data?
A. Cannot be displayed in frequency tables
B. Cannot be analyzed using inferential statistics
C. Cannot support calculation of mean or standard deviation
D. Cannot be used in nursing research
CORRECT ANSWER: C. Cannot support calculation of mean or standard deviation
RATIONALE: Nominal data consist of categories without numerical properties, making mathematical
operations like computing means or standard deviations inappropriate and meaningless.
www.scribd.com
Question 13: When converting ratio data to ordinal categories (e.g., BMI categories: underweight,
normal, overweight, obese), what is the primary consequence for statistical analysis?
A. Increased statistical power
B. Loss of information about magnitude of differences
C. Enhanced ability to calculate correlations
D. Improved normality of distribution
CORRECT ANSWER: B. Loss of information about magnitude of differences
RATIONALE: Collapsing ratio data into ordinal categories discards precise numerical information,
reducing the sensitivity of statistical tests and limiting analytical options.
www.scribd.com
Question 14: Which level of measurement allows for the calculation of all measures of central
tendency and dispersion?
Study Guide 2025, Covering Descriptive and Inferential Statistics, Data
Analysis Techniques, Probability Concepts, Hypothesis Testing, Research
Design, Evidence-Based Practice, Interpretation of Statistical Results, SPSS
Basics, Quantitative and Qualitative Research Methods, Practice Questions
with Detailed Explanations, Step-by-Step Calculations, Real Exam Scenarios,
and Proven Strategies to Successfully Master Nursing Research Statistics
and Achieve High Academic Performance
Question 1: Which level of measurement is characterized by categories that have no inherent order or
ranking?
A. Ordinal
B. Interval
C. Ratio
D. Nominal
CORRECT ANSWER: D. Nominal
RATIONALE: Nominal level of measurement involves categorizing data into mutually exclusive groups
without any intrinsic order or ranking, such as gender, blood type, or diagnosis categories.
www.scribd.com
Question 2: A nurse researcher collects data on patient pain levels using a scale of 1 (no pain) to 10
(worst pain imaginable). This measurement scale is best classified as:
A. Nominal
B. Ordinal
C. Interval
D. Ratio
CORRECT ANSWER: B. Ordinal
RATIONALE: Pain scales using ranked categories (1-10) represent ordinal data because the numbers
indicate order but the intervals between values are not necessarily equal or measurable.
www.scribd.com
Question 3: Which statistical measure is most appropriate for summarizing nominal level data?
A. Mean
B. Median
C. Mode
D. Standard deviation
CORRECT ANSWER: C. Mode
,RATIONALE: The mode, representing the most frequently occurring category, is the only measure of
central tendency appropriate for nominal data since mathematical operations cannot be performed on
categorical values.
www.scribd.com
Question 4: Temperature measured in Celsius is an example of which level of measurement?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
CORRECT ANSWER: C. Interval
RATIONALE: Celsius temperature has equal intervals between values but lacks a true zero point (0°C
does not indicate absence of temperature), making it interval level data.
www.scribd.com
Question 5: Which of the following variables represents ratio level measurement?
A. Patient satisfaction rated as low, medium, or high
B. Hospital unit type (ICU, medical, surgical)
C. Patient weight in kilograms
D. Likert scale responses from strongly disagree to strongly agree
CORRECT ANSWER: C. Patient weight in kilograms
RATIONALE: Weight in kilograms has a true zero point (0 kg indicates absence of weight) and equal
intervals, allowing for meaningful ratios (e.g., 80 kg is twice 40 kg), which defines ratio level
measurement.
www.scribd.com
Question 6: When analyzing ordinal data, which measure of central tendency provides the most
meaningful summary?
A. Mean
B. Median
C. Mode only
D. Geometric mean
CORRECT ANSWER: B. Median
RATIONALE: The median represents the middle value in an ordered distribution and is appropriate for
ordinal data because it relies on rank order rather than equal intervals required for the mean.
www.scribd.com
Question 7: A researcher codes marital status as 1=single, 2=married, 3=divorced, 4=widowed. What is
the highest level of measurement achieved?
,A. Nominal
B. Ordinal
C. Interval
D. Ratio
CORRECT ANSWER: A. Nominal
RATIONALE: Although numbers are assigned, marital status categories have no inherent order or equal
intervals; the numbers serve only as labels, maintaining nominal level measurement.
www.scribd.com
Question 8: Which characteristic distinguishes ratio level measurement from interval level
measurement?
A. Presence of categories
B. Equal intervals between values
C. True absolute zero point
D. Ability to rank order values
CORRECT ANSWER: C. True absolute zero point
RATIONALE: Ratio level measurement includes all properties of interval data plus a true zero point that
indicates complete absence of the attribute being measured, enabling meaningful ratio comparisons.
www.scribd.com
Question 9: In nursing research, Likert scale responses (strongly disagree to strongly agree) are
typically treated as which level of measurement for statistical analysis?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
CORRECT ANSWER: B. Ordinal
RATIONALE: Likert scales produce ordered categories where respondents indicate degree of
agreement, but the psychological distance between response options is not necessarily equal,
supporting ordinal classification.
www.scribd.com
Question 10: Which statistical test requires at least interval level data for appropriate application?
A. Chi-square test
B. Mann-Whitney U test
C. Pearson correlation coefficient
D. Spearman rank-order correlation
CORRECT ANSWER: C. Pearson correlation coefficient
, RATIONALE: The Pearson product-moment correlation coefficient assumes interval or ratio level data
with linear relationships, whereas nonparametric alternatives like Spearman correlation accommodate
ordinal data.
www.scribd.com
Question 11: A study records the number of falls per patient during hospitalization. This variable
represents which level of measurement?
A. Nominal
B. Ordinal
C. Interval
D. Ratio
CORRECT ANSWER: D. Ratio
RATIONALE: Count data such as number of falls have a true zero (no falls), equal intervals, and allow
meaningful ratio statements (e.g., 4 falls is twice 2 falls), satisfying ratio level criteria.
www.scribd.com
Question 12: Which statement accurately describes a limitation of nominal level data?
A. Cannot be displayed in frequency tables
B. Cannot be analyzed using inferential statistics
C. Cannot support calculation of mean or standard deviation
D. Cannot be used in nursing research
CORRECT ANSWER: C. Cannot support calculation of mean or standard deviation
RATIONALE: Nominal data consist of categories without numerical properties, making mathematical
operations like computing means or standard deviations inappropriate and meaningless.
www.scribd.com
Question 13: When converting ratio data to ordinal categories (e.g., BMI categories: underweight,
normal, overweight, obese), what is the primary consequence for statistical analysis?
A. Increased statistical power
B. Loss of information about magnitude of differences
C. Enhanced ability to calculate correlations
D. Improved normality of distribution
CORRECT ANSWER: B. Loss of information about magnitude of differences
RATIONALE: Collapsing ratio data into ordinal categories discards precise numerical information,
reducing the sensitivity of statistical tests and limiting analytical options.
www.scribd.com
Question 14: Which level of measurement allows for the calculation of all measures of central
tendency and dispersion?
