Pre-experimental designs produce the greatest threat to internal and external validity because it provides
A) either no control group or no way to equate the groups used
B) a control group through randomization
C) an equivalent-groups design
D) none of the above

Question

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The Answer of Pre-experimental designs produce the greatest threat to internal and external validity because it provides
A) either no control group or no way to equate the groups used
B) a control group through randomization
C) an equivalent-groups design
D) none of the above

Pre-Experimental Designs Produce the Greatest Threat to Internal and External