A research team wishes to determine which of two types of staff development is more effective. The administrators of a school district agree to the experiment, and all the teachers in two high schools agree to participate and to take the pretest and posttest. However, the administrators insist that the teachers cannot be randomly assigned to the staff development programs. All teachers in one high school must participate in program A, and all teachers in the other high school must participate in program B.
a. If the researchers agrees to this condition, what type of experimental design must she use and why?
b. What is the main threat to internal validity in this type of experimental design, and how can it be handled?

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The Answer of A research team wishes to determine which of two types of staff development is more effective. The administrators of a school district agree to the experiment, and all the teachers in two high schools agree to participate and to take the pretest and posttest. However, the administrators insist that the teachers cannot be randomly assigned to the staff development programs. All teachers in one high school must participate in program A, and all teachers in the other high school must participate in program B.
a. If the researchers agrees to this condition, what type of experimental design must she use and why?
b. What is the main threat to internal validity in this type of experimental design, and how can it be handled?

A Research Team Wishes to Determine Which of Two Types