Please help with this assignment. Wil rate Life saver. Thanks! The study design

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Please help with this assignment. Wil rate Life saver. Thanks!

The study design strategy describes the ways in which people are grouped together and the ways in which the variables are manipulated to answer one or more evaluation questions. A classic example of a design strategy is when individuals are separated into two groups and one group participates in an experimental program (receives the treatment) while the second participates in a placebo program (does not receive the treatment).
For this Application Assignment you will identify study designs and describe the internal validity threats. Save this document on your computer before filling out the form:

Study Designs and Threats to Reliability

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:


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


b. Internal validity threats:


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:

Explanation / Answer

The study design strategy describes the ways in which people are grouped together and the ways in which the variables are manipulated to answer one or more evaluation questions. A classic example of a design strategy is when individuals are separated into two groups and one group participates in an experimental program (receives the treatment)

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