Assume that a random sample of twenty-three students at your university were found to have a mean GPA of 2.8 with a standard deviation of .8 . What would be the best guess of the average GPA of the entire university?
a. 2.8
b. 3.6
c. 2.0
d. 3.0
a
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If a researcher uses a sample that is NOT representative of the population from which it was drawn, the project would show the effect of
a. experimenter bias. b. sampling bias. c. placebo effect. d. subject bias.
What is true of light detection across species??
a. ?For all known species, the eye has evolved to see only visible light. b. ?Visible, infrared, and ultraviolet rays are detected by most species, including humans. c. ?Humans can see visible, ultraviolet, and infrared light; many nonmammalian species, such as insects and snakes, can see only in the visible light range. d. ?Visible light is only detected by humans; some insects can see in the ultraviolet range and snakes can see in the infrared range.
When concepts are defined in terms of the way in which they will be measured, those concepts are said to be:
a. hypothetical variables b. externally valid c. internally valid d. operationally defined
Wilma is upset because she is convinced that her brother has a bigger cookie than she does. Her dad quickly breaks Wilma's cookie in two and tells her that she now has "more" cookie. If Wilma calms down and is convinced that she does have more cookie, it would suggest that Wilma:
a. has not yet mastered object permanence b. understands object permanence c. does not yet understand conservation d. has mastered the concept of conservation