A research involved sending out obtaining information from students using a survey

If a representative sample has been established, randomly assigning participants to groups rather than using pre-determined selection factors (such as degree type, gender, or age) will increase the internal validity.

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A research involved sending out obtaining information from students using a survey

If a representative sample has been established, randomly assigning participants to groups rather than using pre-determined selection factors (such as degree type, gender, or age) will increase the internal validity.

BlackTom AI · Accepted Answer

The question presents a statement about sampling and random assignment in a research design, asking whether it is true or false. 
Option 1: True. The core idea here is that random assignment to groups is a technique that strengthens internal validity by reducing confounding variables and ensuring that groups are comparable at baseline. This improvement in internal validity occurs regardless of how representative the overall sample is. The fact that a representative sample exists mainly concerns external validity (generalizability) rather than internal validity. Therefore, even with a representative sample, using random assignment helps establish causal inferences within the study by balancing both known and unknown factors across groups. The presence of representativeness does not negate the benefits of randomization for internal validity. 
Option 2: False. This option would imply that random assignment does not enhance internal validity or that internal validity depends on pre-determined selection factors rather than randomization. This is incorrect because systematic assignment based on factors like degree type, gender, or age can introduce bias or confounding, undermining internal validity. Random assignment is the standard method to mitigate such biases and improve the internal validity of an experiment. 
In summary, the statement aligns with foundational experimental design principles: random assignment bolsters internal validity, while representativeness of the sample primarily concerns external validity; the two concepts address different validity domains and do not conflict in this context.

FA25: ISE-212 Sec 01 - Hum Factors Exp HFE-ISE 212 Final - Requires Respondus LockDown Browser

A research involved sending out obtaining information from students using a survey If a representative sample has been established, randomly assigning participants to groups rather than using pre-determined selection factors (such as degree type, gender, or age) will increase the internal validity.

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