Question
A researcher ran a study to determine whether massage could help infertile women become pregnant. One hundred and eighty healthy women undergoing treatment with artificial
A researcher ran a study to determine whether massage could help infertile women become pregnant. One
hundred and eighty healthy women undergoing treatment with artificial insemination participated in the
study. By drawing names from a hat, half of the subjects were randomly assigned to receive a massage
treatment 30 minutes before embryo transfer and again 30 minutes after the transfer. The remaining 90
subjects were instructed to lie still for 30 minutes after the embryo transfer. Results: In the massage group,
41 women became pregnant. In the control group, 25 women became pregnant. Explain how each of the
principles of experimental design (comparison, randomization, replication and control) was used in
this study.
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