What type of samples are selected on the basis of researcher judgment?
a. nonprobability
b. probability
c. random
d. simple
a
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A researcher wants to know whether a new drug reduces anxiety. Forty participants who suffer from anxiety disorder are assigned randomly to one of two groups. One group gets the new drug and the other group gets a placebo. Neither group knows which they receive. After 30 days on the drug, their anxiety levels are measured. In this experiment, is the independent variable and is the dependent
variable. a. anxiety, the new drug b. the new drug, the placebo c. anxiety, the placebo d. the new drug, anxiety
Which of the following statements is true regarding fine motor skills?
A fully developed hippocampus is necessary for final maturation of fine motor skills. Fine motor skills mature about 6 months earlier in girls than in boys. Lack of fine motor skill development leads to coordination problems. Delayed development of fine motor skills is sometimes an indicator of a learning disorder.
Emily and her husband are thrilled as they peer into Emily's uterus by means of an ultrasound. The physician reports that the pregnancy appears normal, and that their baby's fingers, toes, heart, and circulatory system are developing as expected. The couple learns that the baby is only ¾ of an inch long. Given this information, the current stage of prenatal development is the __________
a) embryonic period. b) germinal period. c) zygotic period. d) fetal stage.
Which factor decreases the persuasiveness of the source of a message?
A. speaking slowly and carefully B. arguing against one's own self-interest C. speaking confidently D. appearing to be credible