A researcher shows 3-year-old Emilia two small boxes—a familiar crayon box and a plain, unmarked box. When the researcher asks Emilia to pick the box with the crayons in it, Emilia picks the familiar box. The researcher then shows Emilia that the
familiar box is empty and the unmarked box contains crayons. Finally, the researcher introduces Emilia to a puppet named Betty and asks, “Where do you think Betty will look for the crayons?” The researcher is testing Emilia’s grasp of ________.
A) false beliefs
B) conservation
C) irreversibility
D) class inclusion
Answer: A
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If we reject the null hypothesis when it is true, we make a:
a. Type I error. b. Type II error. c. correct rejection. d. correct acceptance.
What was the result of research examining the effects of ginkgo biloba on memory?
A. It did not improve memory in healthy adults. B. Ginkgo biloba improved memory in subjects. C. It improved only declarative memory. D. It was found to be effective in improving memory, but only in young adults.