Mick Jagger wants to do a hearing study on aging rock stars. He has asked old rock stars to assign themselves to one of two groups: a group that rocks for 7 days straight and a group that doesn't rock at all for 7 days. He will do a pretest and posttest on their hearing. This study is:
Explain your answer.
A) one group posttest only design
B) one group pretest-posttest design
C) posttest-only design with nonequivalent groups
D) pretest-posttest nonequivalent control group design
Self-assignment raises doubts about the equivalence of these two groups

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The Answer of Mick Jagger wants to do a hearing study on aging rock stars. He has asked old rock stars to assign themselves to one of two groups: a group that rocks for 7 days straight and a group that doesn't rock at all for 7 days. He will do a pretest and posttest on their hearing. This study is:
Explain your answer.
A) one group posttest only design
B) one group pretest-posttest design
C) posttest-only design with nonequivalent groups
D) pretest-posttest nonequivalent control group design
Self-assignment raises doubts about the equivalence of these two groups

Mick Jagger Wants to Do a Hearing Study on Aging