BAPSY FREE Bachelor of Arts in Psychology: Methodical & Stats Analysis Questions and Answers 2 — Questions and Answers
Question 1: A researcher finds a correlation of r = 0.85 between study hours and exam scores. What percentage of variance in exam scores is explained by study hours?
- 72.25% (Correct answer)
- 85%
- 42.5%
- 50%
Correct answer: 72.25%
The coefficient of determination (r²) is 0.85² = 0.7225, meaning 72.25% of variance is explained.
Question 2: Which measure of central tendency is most appropriate for highly skewed income data?
- Median (Correct answer)
- Mean
- Mode
- Standard deviation
Correct answer: Median
The median is resistant to extreme values and best represents the center of skewed distributions.
Question 3: In a 2x3 factorial ANOVA, how many interaction effects can be tested?
- 1 (Correct answer)
- 2
- 3
- 6
Correct answer: 1
A two-factor ANOVA has exactly one interaction effect between the two independent variables.
Question 4: A psychologist wants to determine if therapy type predicts group membership (improved vs. not improved). Which test is most appropriate?
- Chi-square test of independence (Correct answer)
- Independent samples t-test
- Pearson correlation
- One-way ANOVA
Correct answer: Chi-square test of independence
Chi-square tests whether two categorical variables are independent of each other.
Question 5: What does a p-value of 0.03 indicate in hypothesis testing at α = 0.05?
- Reject the null hypothesis (Correct answer)
- Fail to reject the null hypothesis
- Accept the alternative hypothesis with certainty
- The effect size is large
Correct answer: Reject the null hypothesis
Since p (0.03) is less than α (0.05), there is sufficient evidence to reject the null hypothesis.
Question 6: Which sampling method involves dividing the population into subgroups and randomly selecting from each subgroup?
- Stratified random sampling (Correct answer)
- Cluster sampling
- Convenience sampling
- Systematic sampling
Correct answer: Stratified random sampling
Stratified sampling divides the population into homogeneous strata and samples randomly within each.
BAPSY FREE Bachelor of Arts in Psychology: Methodical & Stats Analysis Questions and Answers 2
A researcher finds a correlation of r = 0.85 between study hours and exam scores.
What percentage of variance in exam scores is explained by study hours?