The workers in a factory are organized into five-person teams. When conducting a work-environment survey, a researcher randomly selected 10 teams to obtain a total sample of 50 workers. The researcher used ____ sampling
a. simple random
b. stratified random
c. proportionate stratified random
d. cluster
d
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According to the trichromatic theory, how do we distinguish red from orange?
a. The two colors produce different velocities of action potentials b. The two colors produce different ratios of responses by types of cones. c. The two colors produce excitation in different areas of the brain. d. The two colors produce different durations of response by most of the cones.
Which child is best described as an "average child"?
a. Georgi, who is well liked by most of her classmates b. Natalya, who has some classmates that like her somewhat and others that dislike her somewhat c. Yuri, who is ignored by his classmates d. Donald, who is disliked by most all of his classmates
Which of the following statements is true in the context of taste aversions?
A) In taste aversion, the unconditioned stimulus can occur hours after the conditioned stimulus. B) In taste aversion, the unconditioned stimulus and conditioned stimulus must be close together in time. C) Taste aversions are unadaptive in nature. D) Taste aversions are a form of systematic desensitization.
A researcher believes that women today weigh less than in previous years. To investigate this belief, she randomly samples 41 adult women and records their weights. The scores have a mean of 111 lbs. and a standard deviation of 12.4 . A local census taken several years ago shows the mean weight of adult women was 115 lbs. The df for determining tcrit = _________
a. 41 c. 39 b. 40 d. need more information