Maria wants to know if identical twins raised in different environments have different IQ scores.What type of research design is NOT available for Maria to use because she cannot randomly assign the participants?
A) non-experimental
B) between-groups
C) correlational
D) experimental

Question

Quizplus · Accepted Answer

The only way to determine causality and manipulate the independent variable (environment) is through experimental design, which requires random assignment of participants. Since Maria cannot randomly assign participants to their environment, experimental design is not available. Non-experimental, between-groups, and correlational designs are still options for Maria, but they may not provide conclusive evidence for causality.

Maria Wants to Know If Identical Twins Raised in Different