A researcher wants to test the effectiveness of two different computer-based instructional methods on teaching a unit on weather in seventh-grade science

A researcher wants to test the effectiveness of two different computer-based instructional methods on teaching a unit on weather in seventh-grade science. The researcher fi nds a teacher who will permit three of his classes to participate: Two classes use the computer-based instruction, and the third receives conventional classroom instruction. The researcher administers a pretest to all students, each class has a different method of instruction, and then a posttest is administered.

a. Specify the design of this study and represent it using the notation system used in this chapter.

b. What statistics would you choose to analyze the data?