O
Lamar is teaching a math course to 180 Incoming students. He is interested in comparing his effectiveness teaching this course using activity-based learning to
his effectiveness teaching this course using textbook presentation. He gives each of his students a pretest and forms two groups of 90 students each. To help
make sure that the groups are similar in composition with respect to factors such as age, math ability, and test anxiety, the students are randomly assigned into
the two groups. One of the two groups is randomly assigned to be taught by Lamar using the activity-based learning approach for the duration of the course,
and the other group will be taught by Lamar using textbook presentation for the duration of the course. At the end of the course, Lamar will test all of the
students again with a posttest, and he will examine the increase in test score from the pretest to the posttest for each group.
(a) First choose whether the procedure described above is an observational study or a designed experiment. Then further
categorize the procedure by choosing the correct type of observational study or designed experiment.
Observational study
O Designed experiment
prospective
O double-blind
O retrospective
O completely randomized
(b) which one of the following best describes the explanatory (Independent) and response (dependent) variables?
The explanatory variable is the teaching approach and the response variable is the math ability.
O The explanatory variable is the math ability and the response variable is the increase in test score.
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