Longitudinal research by Tomlinson-Keasey (1979) indicates that children first develop
conservation of mass, then weight and lastly volume. These findings are support for which one
of the following Piagetian concept?
a. Class inclusion
b. Horizontal décalage
c. Deductive logic
d. Decentration
b. Horizontal décalage
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You are conducting an experiment to determine if listening to music improves learning. If the average test score of the experimental group is higher than the average of the control group, then we can conclude that
a. extraneous variables were not controlled. b. the two groups were not randomly assigned. c. listening to music improved learning. d. listening to music does not improve learning.
Analysis of variance is the most common inferential statistical procedure used to analyze experiments because
a. most researchers are more interested in whether there are differences in the variance among the conditions than in whether there are differences in the means. b. it is the only statistical procedure that can test either between-subjects factors or within-subjects factors. c. there are several different versions of it, and so it can test for possible treatment effects more accurately than the two-sample tests. d. there are several different versions of it, and so it can be used with many different designs.