Ginkgo biloba is an herb that is thought to increase blood flow in the brain and enhance memory processes. In a carefully controlled study investigating this claim, young adults were assigned to one of three groups. Those in group 1 took a capsule containing 120 milligrams of ginkgo biloba once a day. Those in group 2 took a capsule that looked identical but was a fake. Those in group 3 did not take any capsules. The participants assigned to group 2 constituted the _____ in this study.
a. dependent variable
b. placebo control group
c. extraneous group
d. out-of-control group
Answer: b. placebo control group
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Euphoria, lack of anxiety, and relaxation are typical effects of a. cocaine. b. ecstasy. c. PCP
d. opioids.
Experts say that if you are hurt in a large crowd, you should pick a specific person and tell that person to call an ambulance rather than just yelling for help. Selecting a single person is intended to reduce which of the following?
A. social loafing B. process loss C. diffusion of responsibility D. coordination loss
A theory that has well-defined concepts meets the criterion of ______________
Fill in the blank(s) with correct word
____ are the most common white blood cells (i.e., leukocytes) constituting over 50% of the total number. a. Monocytes c. Neutrophils b. Basophils d. Eosinophils
Fill in the blank(s) with correct word