Problem Sheet 9: Internal Validity 1. Place an X after any of the threats listed below that you think might apply to your study: Subject characteristics Instrumentation Maturation Mortality Testing History Subject attitude Implementation Location Regression Other 2. Please describe how you will attempt to control for those threats that you have marked above: 0 Threat #1: I Threat #2: I Threat #3: o Threat #4: What assurances can you provide (through your design, sampling procedures, etc .) to support the claims that your study ndings are valid? In other words how will you convince the reader that the ndings or relationships resulting 'om the study are not due to or explained by something other than what you claim