BAPSY Methodical & Stats Analysis 5 — Questions and Answers
Question 1: A researcher reports a 95% confidence interval of [2.1, 5.8] for a mean difference. This means:
- There is a 95% chance the true mean is in this interval
- 95% of sample means will fall in this range
- If the procedure were repeated, 95% of such intervals would contain the true parameter (Correct answer)
- The null hypothesis is rejected at p < 0.05
Correct answer: If the procedure were repeated, 95% of such intervals would contain the true parameter
A 95% CI means the interval-construction procedure captures the true parameter in 95% of replications, not that this specific interval has a 95% probability.
Question 2: Demand characteristics in psychological research refer to:
- The statistical power required to detect an effect
- Cues that lead participants to guess the study's purpose and alter their behavior (Correct answer)
- The sample size needed to meet IRB requirements
- Experimenter effects on data collection
Correct answer: Cues that lead participants to guess the study's purpose and alter their behavior
Demand characteristics are subtle cues in the experimental setting that hint at the study's purpose, potentially altering participant behavior.
Question 3: Which level of measurement allows meaningful ratio comparisons (e.g., 'twice as much')?
- Nominal
- Ordinal
- Interval
- Ratio (Correct answer)
Correct answer: Ratio
Ratio scales have a true absolute zero point, allowing meaningful statements about proportional differences between values.
Question 4: In structural equation modeling (SEM), a latent variable is:
- A directly observed score on a single item
- An unobserved construct inferred from multiple indicators (Correct answer)
- A residual term in a path model
- A moderating variable between two paths
Correct answer: An unobserved construct inferred from multiple indicators
Latent variables are unobserved theoretical constructs estimated from patterns among multiple observed indicator variables.
Question 5: Hawthorne effects are a threat to internal validity because:
- Participants improve simply due to being observed, not the treatment (Correct answer)
- Researchers selectively report favorable outcomes
- Attrition differs between experimental conditions
- Measurement instruments change over the study period
Correct answer: Participants improve simply due to being observed, not the treatment
The Hawthorne effect occurs when participants change their behavior because they know they are being observed, not because of the experimental manipulation.
Question 6: A moderation effect in regression is tested by:
- Adding a squared term for the predictor
- Including an interaction term (X × Z) in the model (Correct answer)
- Centering the dependent variable before analysis
- Using hierarchical entry with covariates first
Correct answer: Including an interaction term (X × Z) in the model
Moderation is examined by including the product (interaction) term of two predictors; a significant interaction indicates the effect of X depends on the level of Z.
Question 7: Which of the following statements about qualitative research is most accurate?
- It always uses larger sample sizes than quantitative research
- It prioritizes generalizability through probabilistic sampling
- It seeks to understand meaning and lived experience through interpretive analysis (Correct answer)
- It relies exclusively on numerical coding of behavioral observations
Correct answer: It seeks to understand meaning and lived experience through interpretive analysis
Qualitative research emphasizes understanding subjective meaning, context, and experience rather than statistical generalization.
BAPSY Methodical & Stats Analysis 5
A researcher reports a 95% confidence interval of [2.1, 5.8] for a mean difference.
This means: