For Exercises 3.42 to 3.44, see pages 144–145; for 3.45, see page 146; for 3.46 and 3.47, see page 147; for 3.48 and 3.49, see page 150; for 3.50 and 3.51, see page 152; for 3.52, see page 153; for 3.53 and 3.54, see page 154; and for 3.55, see page 156.
3.43 Can they use the Web?
A course in computer graphics technology requires students to learn multiview drawing concepts. This topic is traditionally taught using supplementary material printed on paper. The instructor of the course believes that a web-based interactive drawing program will be more effective in increasing the drawing skills of the students.23 The 50 students who are enrolled in the course will be randomly assigned to either the paper-based instruction or the web-based instruction. A standardized drawing test will be given before and after the instruction. Explain why this study is an experiment, and give the experimental units, the treatments, and the response variable. Describe the factor and its levels. To what extent do you think the results of this experiment can be generalized to other settings?
3.43
It is an experiment because the instructor has assigned the students to one of two instructional methods (paper-based or web-based). The experimental units are students. The treatments are type of instruction, paper-based and web-based. The response is the change in standardized drawing test (pre vs. post). The factor is the instructional method, with levels paper-based and web-based. The results would likely not be widely generalizable because the students were all in the same course but could probably be generalized to the same or similar courses in computer graphics technology.