Natural experiments compare people who have been divided into separate groups
A. through random sampling.
B. through matching.
C. by the researcher.
D. due to accidental life circumstances.
Ans: D. due to accidental life circumstances.
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The height of a wavelength provides information about the __________ of a light stimulus.
A. frequency B. amplitude C. saturation D. purity
Ms. Castle is in the early stages of dementia. Which of the following is most characteristic of the symptoms she is likely to exhibit?
a. She shows writhing movements. b. She cannot be understood when she speaks. c. She can't remember the new neighbor she met yesterday. d. She can't remember the name of the town she grew up in.
A variable that systematically varies along with the independent variable in experimental studies is known as a
A) mediator. B) confound. C) dependent variable. D) moderator.
Which of the following is the correct null hypothesis for an independent-measures t test?
A) ??1 - ?2 = 0 B) ?M1 - M2 = 0 C) ?1 - ?2 ? 0 D) M1 - M2 ? 0