Biology Forums - Study Force

Mr. Jacobs wants to find out whether a new program for teaching physical education promotes students' physical development. He gives his students a number of tests before they begin the program (pretests) and the same tests again after they have been in the program for eight months (posttests). He finds that the students' posttest scores are higher than their pretest scores and so concludes that the program is effective. What is definitely wrong with Mr. Jacobs' conclusion?
A) The posttests should always be different from the pretests.
B) There are other possible explanations for his results.
C) Tests are not a good measure of physical development.
D) Eight months is too short a time for such a program to have a long-term effect.

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