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program planning and evaluation

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Please respond to the following questions either by writing the design name or by describing the design using standard notation (X = program, O=observation, R= random assignment). For each design, please discuss all threats to internal validity.


1. a. Design: Single group post-test only


b. Internal validity threats:


2. a. Design: (R) O1 X O2
(R) O1 O2


b. Internal validity threats:


3. a. Design: Pretest-posttest design with experimental and comparison group


b. Internal validity threats:



4. a. Design: O X O


b. Internal validity threats:



5. a. Design: Single group with three pretests and four posttests


b. Internal validity threats:

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