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1 With a small
effect size, if the smallness is due to inherent variability of the
responses, the web is preferred for the gain in statistical power. If the smallness is due to sensitivity to
conditions, the lab is preferred.
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2 if have
resources for a real proportional sample – use traditional methods (phone,
mail, etc) if not, the web will probably still be more representative than a
college sample but both have significant biases
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2 If the
validity is driven by more varied subject populations – web; if by more varied conditions - lab
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