falisibity

pseduo sincent

irreducable complexity

theroy

princible of design

expriminal bias

percison and accuracy

varibility

presion

type of reproudced

standered deviation

accuracy

central limit of thrrom

validity

type of validity

criterial of internal validity

intrnal validity

threats of internal validity

coundfuding

reapeting measure bias

subject selection

age and maturaiton effect

regression toward the mean

floor and celling effect
