Question

a school psychologist wants to test the effectiveness of a new teaching method of teaching health. she recruits 400 sixth - grade students and randomly divides them into two groups. group 1 is taught by means of the new method, while group 2 is taught via traditional methods. the same teacher is assigned to teach both groups. at the end of the year, an achievement test is administered and the results of the two groups are compared. what is the response variable in this experiment? the score of group 1 on the achievement test the score on the achievement test the score of group 2 on the achievement test the students ability in health which of the following explanatory variables is manipulated? grade level school district teacher method of teaching what type of experimental design is this? blind matched pairs completely randomized

Explanation:

1. Response variable: The response variable is what is being measured as an outcome. Here, the achievement test scores at the end - of - year are being measured to see the effect of the teaching method, so the score on the achievement test for both groups is the response variable.
2. Manipulated explanatory variable: The researcher is changing the method of teaching (new method vs traditional method) to see its impact on student performance. So the method of teaching is the manipulated explanatory variable.
3. Type of experimental design: The students are randomly divided into two groups and different teaching methods are applied. This is a completely randomized design as there is random assignment of subjects (students) to treatment groups (new teaching method and traditional teaching method).

Answer:

1. What is the response variable in this experiment?

• The score of Group 1 on the achievement test, The score on the achievement test of Group 2

1. Which of the following explanatory variables is manipulated?

• method of teaching

1. What type of experimental design is this?

• completely randomized