BAPSY Psychological Research and Statistics 4

Question 1

Which coefficient is most appropriate for assessing inter-rater reliability when both raters use nominal categories?

Accepted Answer

Cohen's kappa

Answer

Cohen's kappa corrects for chance agreement between raters on categorical data, making it the standard for nominal inter-rater reliability.

Question 2

In multiple regression, multicollinearity is a problem because it:

Accepted Answer

Makes it difficult to separate the unique contributions of correlated predictors

Answer

High multicollinearity inflates standard errors of regression coefficients, making it hard to determine each predictor's unique contribution.

Question 3

The distinction between a population parameter and a sample statistic is that:

Accepted Answer

Parameters describe populations; statistics describe samples and estimate parameters

Answer

Parameters (e.g., μ, σ) are fixed but usually unknown values describing a population; statistics (e.g., x̄, s) are calculated from samples to estimate them.

Question 4

A meta-analysis synthesizes findings across studies primarily to:

Accepted Answer

Quantitatively estimate the average effect size across multiple studies

Answer

Meta-analysis uses statistical procedures to combine effect sizes from multiple studies, yielding a more precise overall estimate of an effect.

Question 5

An operational definition in research serves to:

Accepted Answer

Specify exactly how a variable is measured or manipulated in a study

Answer

Operational definitions translate abstract constructs into concrete, measurable procedures, enabling replication and clarity.

BAPSY - Bachelor of Arts in Psychology Practice Test

BAPSY - Bachelor of Arts in Psychology Practice Test

BAPSY Psychological Research and Statistics 4