Hormones are chemicals that are secreted and go directly into __________
a) the bloodstream.
b) specific organs.
c) nerve endings.
d) the brain.
a
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Thomas is on the floor and highly engaged with the toy train engine that he is pushing around the track by himself. Thomas is most accurately said to be engaged in _____ play
a. unoccupied b. solitary c. onlooker d. associative
The basis of an experiment is a. manipulation of a dependent variable
b. manipulation of an independent variable. c. Manipulation of a confounding variable. d. in-depth fact gathering of many variables.
Dr. Jiminez investigated the influence of snacking on the onset of sleep in preschool children. One group of preschoolers ate a candy bar prior to bedtime, and the other group ate nothing. Time until the onset of sleep was recorded for each child. In this experiment, eating or not eating the snack is the __________ variable, and the time until the onset of sleep is the __________ variable.
A. independent; dependent B. dependent; independent C. experimental; control D. control; experimental
In order to experimentally prove that the independent variable is the cause and the dependent variable is the effect we would have to _____
a. observe the dependent variable in the presence of the independent variable b. observe the dependent variable in the absence of the independent variable c. observe changes in the independent variable when the dependent variable is manipulated d. observe changes in the dependent variable when the independent variable is manipulated