There are seven threats to external validity: selection bias, history, experimenter effect, Hawthorne effect, testing effect, aptitude-treatment and situation effect.
There are eight threats to internal validity: history, maturation, testing, instrumentation, regression, selection, experimental mortality, and an interaction of threats.
Review why are these concepts important?
Must be in APA 7th edition format
Must use 2 nursing peer review articles as references no longer than 5 years old and no out of country articles
No personal opinions
Must be written in scholarly paper form
