The idea behind random selection is to try to avoid any factors that will bias your results. Even if test subjects know what you are testing for, they will try to produce that result.
Researchers try to remove any factors that will skew the results one way or another. If random selection methods are not used. The results of the research will probably be invalid.Why is it desirable to have a randomly selected control group in a research design?
you need to compare the experimental group to the control group to see how the variable the experimental group is exposed to affects them... the control group isn't exposed to the variable or manipulated like the experimental group is...the control group should be random because if you selected people for the group in some other way the control group sample wouldn't necessarily be representative of the population being studied-thus your experimental results might be skewed and have less generalizabilityWhy is it desirable to have a randomly selected control group in a research design?
because random is best.
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