If all you do is copy and paste your entire assignment, with no evidence of thinking on your part, nothing will happen since no one here will do your work for you.
But if you are specific about what you don't understand about the assignment or exactly what help you need, someone might be able to assist you. Ask specific questions!
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:
1 answer