Question

Of the categories in internal validity of a study, which ones are the most serious of errors? Which ones have the least likelihood of negatively impacting a study

Answer 1

Of the categories in internal validity of a study, which ones are the most serious of errors? Which ones have the least likelihood of negatively impacting a study?

The category of instrumentation seems to be one of the more serious errors of internal validity. A poorly designed study can have many implications. If the survey does is not well designed in exclusion and inclusion criteria, the researcher cannot confidently present any of the findings. Exclusion and inclusion criteria diminished the chances of outliers and higher weight of a direct cause and effect relationship.

The category of low population validity seems to be one of the more serious errors of external validity. If the findings of a study cannot be generalized outside of the parent research study, this means that the subjects did not represent the rest of the population. Since the subjects are not real-world representatives, the findings cannot be provided to others and do not carry any weight.