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PUBH 6235 Week 8: Study Design/Internal Validity 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:

PUBH 6235

Week 8: Study Design/Internal Validity

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:

 

 

  1. a. Design: (R)  O1  X  O2

(R) O1       O2

 

b. Internal validity threats:

 

 

  1. 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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