Research suggests that the two most basic states of sleep are
a. alpha sleep and beta sleep.
b. light sleep and deep sleep.
c. REM sleep and non-REM sleep.
d. REM sleep and paradoxical sleep.
c
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Research on rods and cones has revealed that:
a. the center of the retina contains a mixture of about 75 percent rods and 25 percent cones. b. there are about 120 to 125 million rods and about 7 or 8 million cones in the retina. c. the outer edges of the retina, which are responsible for peripheral vision, contain only cones. d. rods are more effective than cones in distinguishing different wavelengths of light.
Suppose that a particular pattern of responses on a personality test is characteristic of 95 percent of people with some rare psychological disorder (occurring in 1 percent or less of the population), and 5 percent of normal people. If we use the test result to identify whether or not someone has the disorder, how often will we be correct?
a. Less than 50 percent b. About 50 percent c. 95 percent d. More than 95 percent