An experimenter uses the pretest posttest design to test the effectiveness of a new drug. The statement that the new drug does not affect the posttest score is the _____
a. null hypothesis c. directional alternative hypothesis
b. treatment hypothesis d. nondirectional alternative hypothesis
A
The null hypothesis states that the treatment has no effect on the dependent measure.
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Which of the following is TRUE of "culture-free" intelligence tests?
a. They have been in use for more than 20 years. b. They have been largely successful. c. These tests have never been developed. d. They have not lived up to their promise.
An emotional state marked by worry, apprehension, and tension is known as
a. frustration. b. fear. c. stress. d. anxiety.
In middle adulthood, the ego strength of (including ideas) deeply at heart
a. will b. care c. persistence d. confidenceleads to having the welfare of people and enduring things
Most conference presentations are ____ minutes in length
a. 5 to 10 b. 10 to 15 c. 15 to 20 d. 20 to 25