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Which of the following is not a necessary component of a valid experimental design? Control over...

Which of the following is not a necessary component of a valid experimental design?

Control over the effects of lurking variables.

Neither the subject nor the experimenter should know who is receiving which treatment.

Replication on enough subjects to control for variability.

Blocking.

Randomization to control for bias between experimental groups.
Math   Statistics-And-Probability   
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