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what is studies that show how chacteristics/behaviors change with age, growth or maturation
what attempts to determine whether a relationship exists between 2 variables and to what degree
what is it when the researcher attempts to limit the effect of multiple variables, to look at the effect of the indep variable on the depend variable; an attempt to simplify the research problem
Sampling bias or too small of a sample
what is it when groups differ on certain variables from the start
Lack of experimental control
what is it when reserchers failed to account for variables that could have influenced the results (confounding variables)
what is something with established validity that can be used to measure the validity of something else
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