Dr. Esterson is studying the effect of caffeine on laboratory rats. He has decided that he will give the rats 100 milligrams of caffeine three times a day, and then run them through mazes at various points to see if
there is any change in the time it takes to complete the maze. Based on his review of existing research addressing this topic, Dr. Esterson believes that the rats will complete the maze the fastest immediately after they ingest the caffeine. Dr. Esterson's belief about the results he will find is called a(n):
a. covariate.
b. construct.
c. theory.
d. hypothesis.
Answer: D
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Indicate whether this statement is true or false.
Which of the following statements about suicide hotlines in the United States is most true?
A. There has been a steady decrease in the number available since the 1960s. B. There are millions available. C. They have not been shown to have much impact on suicide rates. D. They boast a near 100 percent success rate.