Which of the following is NOT an assumption of the Wilcoxon rank-sum test?
a. The data are ratio, interval, or ordinal in scale, all of which must be converted to ranked (ordinal) data before conducting the test
b. The underlying distribution is not normal.
c. The observations are independent.
d. There is homogeneity of variance.
d
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Conclusions based on the prisoner’s dilemma game (PDG) have been questioned, because when people compete for high stakes (e.g., thousands of dollars) they become far more cooperative than the PDG results would suggest.
a. True b. False
Depression in children is characterized by ____
a. helplessness b. apathy c. contentment d. mania
Jarred, age 5, describes himself as a good soccer player with black hair who laughs a lot. His description demonstrates his developing
self-esteem. self-concept. self-deprecation. self-criticism.
Kate, a longtime coffee drinker, complains of pounding headaches and lowered mood when she skips her coffee in the morning. What is the likely cause of these complaints?
A. a change in GABA B. psychological addiction C. removal of a psychoactive drug from diet D. a placebo effect