Threats to internal validity
• History – refers to occurrence of events that influence experimental units during the course of the study
• Maturation – refers to the biological or psychological processes which occur among the subjects in a relatively short time and which influence research findings
• Instrumentation -
• Pre-testing – solution – use equivalent form tests
• Statistical regression
• Attrition- subjects dropping out of the study before completion- leads to error, biasness in the sample
• Differential selection – occurs when subjects are systematically selected for a study - volunteers and non-volunteers – biasness leads error
• Selection – maturation interaction
• Ambiguity - when correlation is taken for causation
• Apprehension - when people are scared to respond to your study
• Demoralization - when people get bored with your measurements
• Diffusion - when people figure out your test and start mimicking symptoms
Threats to external validity
• Accessible and target population
• Control of extraneous variables
• Pre-test treatment interaction
• Explicit description of the sample
• Multi-treatment interference
Titany answered the question on October 21, 2021 at 13:04
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