A 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. In order to test her hypothesis the teacher should have which group receive vocabulary instruction?
a. Those who volunteer
b. The best students
c. The poorest students
d. A randomly selected group
e. Good students who show poor concentration
Ques. 2Identify the major threat to internal validity in the following research studies. Students who had low scores on a reading pretest were chosen for a special instructional program. This group showed significant gains on a reading achievement test administered after a period of four months.
a. Regression
b. Diffusion
c. Mortality
d. Selection
e. History
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. This study would be classified as
a. correlational
b. causal-comparative
c. experimental
d. survey research.
e. trend research
Ques. 4Identify the major threat to internal validity in the following research studies. A teacher researcher randomly assigned students within a classroom to two groups, one of which received some special instructional materials to take home with them to study and to use with homework assignments. The C group did not get the special materials. The researcher was surprised to find that there weren't significant differences between the two groups on achievement tests and other selected measures.
a. Regression
b. Diffusion
c. Mortality
d. Selection
e. History
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