A researcher is studying the effect of word games on spelling achievement. Of two randomly assigned groups one receives experience with word games, while the other does not. A spelling test is then administered. This design is
a. counterbalanced.
b. randomized subjects, posttest only control group.
c. a simple 2 x 2 factorial.
d. a static group
Question 2
A test has a score reliability of .70 . This means
a. if the test were administered again, at least .70 percent of the subjects would obtain the same score.
b. the test is 70 percent effective in measuring whatever it does measure.
c. 70 percent of the variance in the observed scores is free of error.
d. 70 percent of the variance in the observed scores is error variance.
Studying the Canopy
First-pass effect: (a) drugs are absorbed; (b) drugs enter hepatic portal circulation and go directl
The Placebo Effect
Greenhouse Effect
Identification of the numbers in the Word Problem
The effect of gene–environment interaction