15.& Three high schools participated in a study to evaluate the effectiveness of

Question

15.& Three high schools participated in a study to evaluate the effectiveness of a new computer based mathematics curriculum. In each school, four 24-student sections of freshman algebra were available for the study. The two types of instruction (standard curriculum, computer- based curriculum) were randomly assigned to the four sections in each of the three schools At the end of the term, a standard mathematics achievement test was given to each of the 24 students in each section. a. Is this study experimental, observational, or mixed experimental and observational? Why? b. Identify all factors, factor levels, and factor-level combinations. c. What type of study design is being implemented here? d. What is the basic unit of study?

Explanation / Answer

a) This study is observational as all the students taken at random are observed.

b) Factors are standard curriculum, computer based curriculum and levels of four sections in each of three schools

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