In a grouped frequency distribution one interval is listed as 50-59. Assuming that the scores are measuring a continuous variable, what are the real limits of this interval?
A) ?50 and 59
B) ?50.5 and 59.5
C) ?49.5 and 59.5
D) ?49.5 and 60.5
C
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When a child has reached the single-word stage, what percent of single words refer to objects and to actions?
A. 20% to objects and 80% to actions B. 80% to objects and 20% to actions C. 50% to objects and 50% to actions D. 70% to objects and 30% to actions
Fred smokes about half a pack of cigarettes a day. Although he takes Vitamin B supplements, during the day, he is tired, irritable, and has trouble concentrating. What might be the culprit?
a. A lack of sleep b. Problems with his diet c. A lack of a support group d. Too much smoking
Gene therapy has been used to produce an effective treatment for ______.
A. cancer B. adrenoleukodystrophy C. Parkinson's disease D. clinical depression
Treatments that have documented research evidence that they are effective are termed
a. evidence-based treatments. b. empirically based treatments. c. exceptional treatments. d. effective treatments.