Paper 1 · Research Aptitude
The researcher manipulates two or more independent variables (factors) simultaneously to observe their effects on the dependent variable, which allows the testing of two or more hypotheses in a single project. This is called
ARandomized block design
BFactorial design ✓ Correct
CNon-randomized design
DQuasi-experimental research
Correct answer: (B) Factorial design — Manipulating two or more independent variables at once is a factorial design, so that is the answer.
Explanation
★Manipulating two or more independent variables at once is a factorial design, so that is the answer.
★A factorial design varies two or more factors together in the same experiment.
★So it can observe their separate and joint effects on the dependent variable.
★This lets the researcher test two or more hypotheses within a single project.
★A randomized block design groups similar subjects into blocks to control one nuisance factor, not this.
★A non-randomized or quasi-experimental design lacks full randomization, so manipulating several factors together is a factorial design.
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