Q.1 Which statistical tool is most appropriate for comparing the means of two independent groups?
Chi-square test
Independent t-test
ANOVA
Correlation
Explanation - An independent t-test is used to compare the means of two independent groups to determine if they are statistically different.
Correct answer is: Independent t-test
Q.2 What does a p-value less than 0.05 typically indicate in nursing research?
High reliability
Statistical significance
Bias in results
No difference between groups
Explanation - A p-value less than 0.05 suggests that the results are statistically significant and unlikely due to chance.
Correct answer is: Statistical significance
Q.3 Which test is used to analyze the relationship between two categorical variables?
t-test
Chi-square test
Pearson correlation
Regression analysis
Explanation - Chi-square test is appropriate for determining associations between two categorical variables.
Correct answer is: Chi-square test
Q.4 Which measure of central tendency is most affected by extreme values?
Mean
Median
Mode
Standard deviation
Explanation - The mean is highly influenced by extreme values, while the median and mode are more resistant.
Correct answer is: Mean
Q.5 Which statistical method is best for predicting patient outcomes based on multiple independent variables?
Chi-square test
ANOVA
Multiple regression
t-test
Explanation - Multiple regression is used to predict a dependent variable based on several independent variables.
Correct answer is: Multiple regression
Q.6 In nursing research, what does standard deviation measure?
Average value
Spread of data
Relationship between variables
Probability of error
Explanation - Standard deviation measures how much individual data points deviate from the mean.
Correct answer is: Spread of data
Q.7 Which statistical test is appropriate for comparing means among three or more groups?
Chi-square test
ANOVA
Paired t-test
Correlation
Explanation - ANOVA (Analysis of Variance) is used when comparing means among three or more groups.
Correct answer is: ANOVA
Q.8 Which type of data is best analyzed using median?
Nominal
Ordinal
Interval
Ratio
Explanation - Median is best for ordinal data where values are ranked but differences between them are not uniform.
Correct answer is: Ordinal
Q.9 What does Pearson’s correlation coefficient (r) measure?
Difference between groups
Strength of association
Central tendency
Data distribution
Explanation - Pearson’s r measures the strength and direction of the linear relationship between two continuous variables.
Correct answer is: Strength of association
Q.10 Which of the following is a non-parametric test?
ANOVA
Mann-Whitney U test
t-test
Pearson correlation
Explanation - The Mann-Whitney U test is a non-parametric alternative to the independent t-test.
Correct answer is: Mann-Whitney U test
Q.11 What is the primary purpose of using descriptive statistics in nursing research?
Make predictions
Summarize data
Test hypotheses
Establish causation
Explanation - Descriptive statistics summarize and organize data for easier understanding.
Correct answer is: Summarize data
Q.12 Which measure is used to assess the reliability of a research tool?
Mean
Standard deviation
Cronbach’s alpha
Chi-square
Explanation - Cronbach’s alpha measures the internal consistency and reliability of a scale.
Correct answer is: Cronbach’s alpha
Q.13 In regression analysis, the variable being predicted is called:
Independent variable
Dependent variable
Control variable
Covariate
Explanation - In regression, the dependent variable is the outcome being predicted based on independent variables.
Correct answer is: Dependent variable
Q.14 Which distribution is most commonly assumed in parametric tests?
Normal distribution
Poisson distribution
Binomial distribution
Exponential distribution
Explanation - Most parametric tests assume data follows a normal distribution.
Correct answer is: Normal distribution
Q.15 What does an r-value of -0.85 indicate?
Weak positive correlation
Strong negative correlation
No correlation
Perfect correlation
Explanation - An r-value of -0.85 indicates a strong inverse relationship between two variables.
Correct answer is: Strong negative correlation
Q.16 Which of the following is a measure of variability?
Mode
Median
Range
Mean
Explanation - Range is a simple measure of variability representing the difference between the highest and lowest values.
Correct answer is: Range
Q.17 Which test compares means from the same group at two different times?
Independent t-test
Paired t-test
Chi-square
Regression
Explanation - Paired t-test is used to compare means of the same group under two conditions.
Correct answer is: Paired t-test
Q.18 The area under a normal distribution curve represents:
Probability
Error
Mean value
Variance
Explanation - The total area under the curve equals 1, representing the probability distribution.
Correct answer is: Probability
Q.19 What does a Type I error mean in hypothesis testing?
Accepting a false null hypothesis
Rejecting a true null hypothesis
Accepting a true null hypothesis
Rejecting a false null hypothesis
Explanation - Type I error occurs when a true null hypothesis is incorrectly rejected.
Correct answer is: Rejecting a true null hypothesis
Q.20 Which statistic best represents the middle value in a skewed distribution?
Mean
Median
Mode
Standard deviation
Explanation - Median is less influenced by skewness and extreme values compared to mean.
Correct answer is: Median
Q.21 Which test is used for analyzing time-to-event data in nursing research?
Chi-square
Kaplan-Meier survival analysis
ANOVA
Paired t-test
Explanation - Kaplan-Meier is commonly used to estimate survival rates over time.
Correct answer is: Kaplan-Meier survival analysis
Q.22 What does a confidence interval of 95% imply?
Results are always accurate
There is a 95% chance the population parameter lies within the interval
The study is error-free
The hypothesis is true
Explanation - A 95% CI means that if the study were repeated, the parameter would fall within the range in 95% of cases.
Correct answer is: There is a 95% chance the population parameter lies within the interval
Q.23 Which test would be best to determine if two variables are independent?
Chi-square test
t-test
ANOVA
Regression
Explanation - Chi-square is used to determine whether two categorical variables are independent.
Correct answer is: Chi-square test
Q.24 The process of reducing many variables into fewer factors is called:
Regression
Factor analysis
ANOVA
Correlation
Explanation - Factor analysis is a data reduction technique that groups related variables into factors.
Correct answer is: Factor analysis
Q.25 Which test is most suitable for small sample sizes with categorical data?
t-test
Fisher’s exact test
ANOVA
Pearson correlation
Explanation - Fisher’s exact test is recommended for categorical data with small sample sizes.
Correct answer is: Fisher’s exact test