In a well-designed experiment,which of the following conditions is necessary?
A) that all participants are treated in exactly the same manner except for the specific differences the experimenter wants to create
B) that all participants are matched on important subject variables
C) that all participants accurately represent the groups in the population
D) that all participants of different types are assigned to the appropriate conditions in a balanced way

Question

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A well-designed experiment requires that all participants are treated in exactly the same manner, except for the specific differences that the experimenter wants to create. This ensures that any differences observed between the groups are due to the manipulation of the independent variable, rather than extraneous factors. Matching on subject variables (B) and representative sampling (C) are important considerations in research, but not necessarily necessary for a well-designed experiment. Assigning participants to conditions in a balanced way (D) is important for reducing the potential for confounds, but not required for a well-designed experiment.

In a Well-Designed Experiment,which of the Following Conditions Is Necessary