random assignment of participants to groups an important aspect of a properly designed experiment------- If the participants are randomly assigned, the researcher can assume that the people in each of the groups are pretty similar.
Why is random assignment important in an experiment ?
The purpose of random assignment is to allow the experimenter to prevent the participants from knowing which condition they were assigned to. The purpose of random assignment is to equalize participants' characteristics across all conditions of an experiment.
What is the most important reason for using random sampling in experiments?
Random sampling ensures that results obtained from your sample should approximate what would have been obtained if the entire population had been measured. The simplest random sample allows all the units in the population to have an equal chance of being selected.
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