To guard against most threats to internal validity in the classical experiment the researcher should:
A) focus upon external validity
B) focus upon generalizability
C) use random assignment
D) put subjects only in experimental groups

Question

Quizplus · Accepted Answer

Random assignment helps ensure that any differences between the experimental and control groups are due to chance rather than some other pre-existing factor. This helps guard against threats to internal validity such as selection bias or confounding variables. Focusing on external validity or generalizability is important but does not directly address threats to internal validity. Putting subjects only in experimental groups also does not address potential confounding variables or selection bias.

To Guard Against Most Threats to Internal Validity in the Classical