A Solomon four-group design differs from a classic experimental design in that the former
a. does not include a pre-test.
b. adds an experimental and control group that does not have a pre-test.
c. can be used to sort out the effects of selection bias.
d. can be used to differentiate the effects of placebos from other variables.
e. none of these
b
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Indicate whether the statement is true or false
What are unobtrusive measures?
What will be an ideal response
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Fill in the blank(s) with the appropriate word(s).