The design name or by describing the design using standard

Reference no: EM13394619

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 O(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:

Reference no: EM13394619

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