One of the most valuable pieces that contribute to psychology is research. Research helps us elucidate the why and how, of theories used to understand human behavior. There are several types of research methods in psychology, some methods include Experimental, Survey, Correlational & Archival Research. These methods involve testing variables, which are known as behaviors, events, or other characteristics that can change, or vary, in some way. When conducting research, some test may be repeated using different research methods. According to Dr. Saul McLeod of Simply Psychology "if a measurement is repeated and the same result is obtained then it is described as being reliable." Therefore, to ensure they obtain reliable and accurate results, a scientist may use various types of research methods.
Samantha Green, from what you have written in your question (much of which seems to be a bit of a jumble but also a mini lecture about things that are common, and very basic, knowledge), I suggest you try to examine the difference between replication in research versus test-retest reliability.
I hope that's helpful.
Samantha Green Multivariate studies study various associations between variables by assessing their multiple correlations or regression effects at the same time. Multivariate analysis can also investigate mediated interactions, in which one variable influences another via a third, mediating variable.
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