NURS 4581 EXAM 3: NURSING
RESEARCH AND EVIDENCE-BASED
PRACTICE
1. A researcher determines that the probability of a Type II error in their study is 0.20. What is
the power of this study?
A. 0.05
B. 0.20
C. 0.95
D. 0.80
Answer: D
Conceptual Explanation: Power is calculated as 1 minus the probability of a Type II error
(1 - Beta). Therefore, 1 - 0.20 = 0.80.
2. Which threat to internal validity occurs when an external event happens during the study
that influences the dependent variable?
A. Maturation
B. Testing
,C. Mortality
D. History
Answer: D
Conceptual Explanation: History refers to events occurring between the first and second
measurements that are not part of the manipulation but affect the outcome.
3. In a normal distribution, approximately what percentage of scores fall within one standard
deviation above and below the mean?
A. 95%
B. 99%
C. 68%
D. 50%
Answer: C
Conceptual Explanation: According to the empirical rule for normal distributions,
approximately 68% of data falls within one standard deviation of the mean.
4. Which statistical test is most appropriate for comparing the means of three or more
independent groups?
A. Independent t-test
B. Chi-square
C. ANOVA
, D. Pearson correlation
Answer: C
Conceptual Explanation: ANOVA (Analysis of Variance) is used to determine if there are
statistically significant differences between the means of three or more independent
groups.
5. Which coefficient value indicates the strongest relationship between two variables?
A. -0.85
B. 0.10
C. 0.75
D. -0.20
Answer: A
Conceptual Explanation: The strength of a correlation is determined by the absolute
value of the coefficient. 0.85 is higher than 0.75, regardless of the negative sign.
6. A nurse researcher is looking for a ‘lived experience’ of patients undergoing chemotherapy.
Which qualitative design is most appropriate?
A. Grounded Theory
B. Ethnography
C. Phenomenology
D. Case Study
RESEARCH AND EVIDENCE-BASED
PRACTICE
1. A researcher determines that the probability of a Type II error in their study is 0.20. What is
the power of this study?
A. 0.05
B. 0.20
C. 0.95
D. 0.80
Answer: D
Conceptual Explanation: Power is calculated as 1 minus the probability of a Type II error
(1 - Beta). Therefore, 1 - 0.20 = 0.80.
2. Which threat to internal validity occurs when an external event happens during the study
that influences the dependent variable?
A. Maturation
B. Testing
,C. Mortality
D. History
Answer: D
Conceptual Explanation: History refers to events occurring between the first and second
measurements that are not part of the manipulation but affect the outcome.
3. In a normal distribution, approximately what percentage of scores fall within one standard
deviation above and below the mean?
A. 95%
B. 99%
C. 68%
D. 50%
Answer: C
Conceptual Explanation: According to the empirical rule for normal distributions,
approximately 68% of data falls within one standard deviation of the mean.
4. Which statistical test is most appropriate for comparing the means of three or more
independent groups?
A. Independent t-test
B. Chi-square
C. ANOVA
, D. Pearson correlation
Answer: C
Conceptual Explanation: ANOVA (Analysis of Variance) is used to determine if there are
statistically significant differences between the means of three or more independent
groups.
5. Which coefficient value indicates the strongest relationship between two variables?
A. -0.85
B. 0.10
C. 0.75
D. -0.20
Answer: A
Conceptual Explanation: The strength of a correlation is determined by the absolute
value of the coefficient. 0.85 is higher than 0.75, regardless of the negative sign.
6. A nurse researcher is looking for a ‘lived experience’ of patients undergoing chemotherapy.
Which qualitative design is most appropriate?
A. Grounded Theory
B. Ethnography
C. Phenomenology
D. Case Study
