Problem Sheet

Problem Sheet 9: Internal Validity

1. My question or hypothesis is: ____________________________________________

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2. I have placed an X in the blank in front of four of the threats listed below that apply to my
   study. I explain why I think each one is a problem and then explain how I would attempt to
   control for the threat.

Threats:

______ Subject characteristics ______ Mortality ______ Location

______ Instrumentation ______ Testing ______ History

______ Maturation Subject ______ Regression

______ Implementation ______ Attitude ______ Other

Threat 1: _______________ Why? ___________________________________________

________________________________________________________________________

I will control by __________________________________________________________

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Threat 2: _______________ Why? ___________________________________________

________________________________________________________________________

I will control by __________________________________________________________

________________________________________________________________________

Threat 3: _______________ Why? ___________________________________________

________________________________________________________________________

I will control by __________________________________________________________

________________________________________________________________________

Threat 4: _______________ Why? ___________________________________________

________________________________________________________________________

I will control by __________________________________________________________

________________________________________________________________________

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