The fact that people may learn from test taking is an experimental validity threat known as ____; the fact that the measurement scale may change over the course of the experiment is called ____.
a. instrumentation; testing effect c. testing effect; instrumentation
b. maturation; testing effect d. instrumentation; selection
Ques. 2Indicate whether the following statements refer to internal validity or external validity. Are the findings of this study a result of the experimental treatment?
a. internal validity b. external validity.
Ques. 3A third grade teacher feels that vocabulary instruction will help her children improve their reading scores. Half of her class receives vocabulary instruction, while the other half has a library period. She will compare reading scores after four months. Suppose the group with vocabulary instruction ends up with statistically higher reading scores than those without vocabulary training. Assuming that there are no problems of internal validity, the teacher should
a. reject the null hypothesis. c. reject the experimental hypothesis.
b. retain the null hypothesis. d. declare the hypothesis as proven.
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