PRC Statistical Analysis & Software 3

Question 1

A researcher uses listwise deletion to handle missing data. What is the primary risk of this approach?

Accepted Answer

It can introduce bias if data are not missing completely at random

Answer

Listwise deletion can produce biased estimates when missingness is related to observed or unobserved variables (MAR or MNAR mechanisms).

Question 2

Which SAS procedure is used to run a multiple linear regression?

Accepted Answer

PROC REG

Answer

PROC REG in SAS performs ordinary least squares regression, including multiple regression with several predictors.

Question 3

Cronbach's alpha is a measure of:

Accepted Answer

Internal consistency reliability

Answer

Cronbach's alpha quantifies how consistently items on a scale measure the same underlying construct (internal consistency).

Question 4

In a 2×2 factorial ANOVA, an interaction effect means:

Accepted Answer

The effect of one factor depends on the level of the other factor

Answer

An interaction indicates that the relationship between one independent variable and the outcome differs across levels of the second independent variable.

Question 5

Which Python library is most commonly used for statistical modeling and hypothesis testing in research?

Accepted Answer

SciPy/statsmodels

Answer

SciPy and statsmodels provide a broad range of statistical tests, regression models, and inferential statistics tools for Python-based research.

(PRC) Professional Researcher Certification Practice Test

(PRC) Professional Researcher Certification Practice Test

PRC Statistical Analysis & Software 3