A correlation coefficient of -.20 indicates a
a. mild, inverse correlation. c. mild, direct correlation.
b. strong, inverse correlation. d. nonexistent correlation.
A
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Cyrus is studying the effects of meditation on coping with illness. In his sample of participants with serious illness, he has the treatment group do an hour-long meditation and the control group listen to the news for an hour. To eliminate the possibility that the meditation, rather than a difference in how comfortable the chairs used by the treatment and control group participants were, causes changes in the participants' coping, Cyrus should use: _______
A. random assignment B. random sampling C. experimental control D. a prospective design
What is the most common mechanism that causes heart disease?
A) Decreasing oxygen supply to the heart due to the build-up of plaque on artery walls B) Decreasing oxygen supply to the heart due to the rupture of an artery C) Increasing pressure on the heart because of untreated high blood pressure D) Shock to the heart caused by high levels of cortisol