Sources of internal invalidity in research studies include confounding variables, selection bias, measurement bias, and researcher bias. These factors can affect the internal validity of the study results and make it difficult to draw accurate conclusions about the relationship between variables.
What is internal and external sources?
Main sources of internal heat are Magmatism and Radioactivity.
external or internal sources
lack of validity
No good, invalid.
Internal sources of information could be a database management system that is used by the company. Employees and management are also examples of internal sources of information. External sources are outside of the organization and harder and could include studies and market research.
internal sources are personnel, colleagues and the library whereas external sources can be consultants andservice providers and catalougues.
entourage
pressure
the sources of info. is the important sources to produce , a company or what ever the sources is the biggest part our move or etc
there are internal and external sources of financing. internal sources are things like selling assets such as computers and machinery other internal sources are retained profit and your own personal money. external sources are things like loans, grants and overdrafts.
what is science