8 Select the correct answer.
What can help Diane improve her verbal communication?
O A. practicing appropriate facial expressions for her speech
OB.
reading newspapers and magazines daily
learning the proper pronunciation of the words in her speech
Oc.
OD
maintaining eye contact with her audience during her speech
raising her voice and speaking loudly
OE.
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Why is it important in an experiment to test the effectiveness of a drug? a. a placebo makes the sample less representative of the population but the data can still be used to make inferences about the population. b. a placebo is important so that results from subjects given a treatment can be compared with the results from subjects given a placebo. c. a placebo makes the sample more representative of the population. d. a placebo exaggerates any psychological differences between the control group and the treatment group.