3- Identify the major threat to internal validity in the following research stud

Question

3- Identify the major threat to internal validity in the following research studies.

A researcher conducted a semester-long experiment comparing two instructional programs in math. During the administration of tests during the semester, the researcher found that about ten percent of the experimental group and about five percent of the control group were absent for each administration.

Select one:

a. Regression

b. Diffusion

c. Mortality

d. Selection

e. History

7-An elementary teacher had a student, Andy, who showed signs of hyperactivity in the classroom. The teacher wanted to “experiment” to find ways to reduce the hyperactivity and bring about behavior more conducive to learning. She began to record the number of incidences of hyperactive behavior. After a period of time, she started to praise Andy and gave him tokens when he stayed in his seat and showed other less hyperactive behavior. The praise and tokens continued during which time the teacher observed and recorded Andy’s behavior. The teacher then stopped the praise and the tokens and took measures of Andy’s behavior.. What data would the teacher look for to determine the effectiveness of her “treatment”?

Select one:

a. a decrease in hyperactivity during the treatment phase.

b. an increase in hyperactivity during the treatment phase.

c. an increase in hyperactivity during the “return to baseline” period.

d. a increase in hyperactivity when the B phase is re-instated.

8-A research study has a design with two groups receiving a pretest, one of which receives treatment, and two groups who are not pretested, one of which receives treatment. This is a

Select one:

a. counterbalanced design.

b. multiple group pretest-posttest design.

c. Solomon design.

d. 2 ´ 2 factorial design.

9-Counterbalanced designs

Select one:

a. give the same treatments to all subjects.

b. may involve many groups and treatments.

c. rotate intact groups.

d. All of these are true.

10- A researcher wants to study the effect of three treatments, social class, and gender on a dependent variable. The best design to use is

Select one:

a. counterbalanced.

b. one-group time series.

c. factorial.

d. randomized control group pretest-posttest.

Explanation / Answer

3) we have to found the factor by which the internal validity can be affected .internal validity refers to how well the experiment is carried out and in practical sense it can be affected by many factors

in this question the internal validity is affected by the mortality as the 10% and 5% of students in the respective groups were absent and mortality means when the people are not taken into consideartion. therefore option c is correct.

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