Discuss internal and external threats to validity; identify and define those threats that are related to measurement and the threats that are related to sampling issues.
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Reviewing Internal and external threats to validity and Identifying and defining those threats that are related to measurement and the threats that are related to sampling issues:
Internal validity is the extent to which sufficient evidence supports a causal relationship between two variables in experimental research. It looks at how well the research design, was conducted , how well the variables were measured and how well the operational definitions were used, and how confidently a person can conclude that the changes in the dependent variable is due to changes in the independent variable and not due other extraneous variables. The internal validity threats are those that may compromise an experiments internal validity and are often related to measurements since internal validity is concerned with the extent to which a person can confidently conclude that the changes and measurements in the dependent variable are due to changes and measurements in the independent variable (Briggs, 2008).
There are eight variables that are a threat to internal validity and …
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