Ahmed is aboard a ship and is scanning the ocean, hoping for a sight of land. The kind of
eye movements he is using are called __________ movements.
a. conjugate
b. pursuit
c. smooth pursuit
d. saccadic
e. scanning
d. saccadic
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Which of the following statements about physical activity in U.S. schools is true?
A) Only six U.S. states require 45 minutes of physical education per day through the high school years. B) More than two-thirds of school-age children do not attend any physical education classes during a typical school week. C) Most U.S. states require some physical education in every grade. D) Only one state mandates at least 30 minutes of physical education per day in elementary school.
By controlling all extraneous variables and by randomly assigning people to different experimental conditions, an experimenter can achieve high
a. interjudge reliability. b. generalizability. c. replicability. d. internal validity.