Stating that the null hypothesis is false when it is in fact true.
Range of the middle 50 of the values; Q3-Q1 75th percentile - 25th percentile
A statistical relation between two or more variables such that systematic changes in the value of one variable are accompanied by systematic changes in the other
A variable whose effect on the response variable cannot be separated from the effect of the explanatory variable on the response variable. Note: Usually confounded variables are lurking variables but only a few lurking variables are also confounded.