Answer:
a) questionnaires
b) attitudes of student who had and who hadn't taken the course
c) difference in age group of students among whom questionnaire were distributed in both the groups.
d) restrict the age group in both the experimental groups.
Explanation:
The complete quetion is:
An investigator was interested in studying the effect of taking a course in child development upon attitudes toward childrearing. At the end of the semester, the researcher distributed a questionnaire to students who had taken the child development course. Questionnaires were also given to an equal number of students who had not taken the course. The students who had taken the child development course had different attitudes from the students who had not taken the course (cg., they had more positive response about having large families).
a) Identify the independent variable
b) Identify the dependent variable
c) identify confounding variable
d) propose a method to unconfound the experiment
a) questionnaires
b) attitudes of student who had and who hadn't taken the course
c) difference in age group of students among whom questionnaire were distributed in both the groups can lead to different understanding of questionnnaire and so affect the response towards the questions.
d) restrict the age group in both the experimental groups.
Confounding variables are variables that effect both the dependent and independent variable
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