This document requires Netscape 3.x or compatible Web Browser. It is the probability that the investigator will conclude that a relationship exists between independent and dependent variables when no such relationship exists. It is represented by the lowercase Greek letter alpha.
Beta is the probability of accepting or retaining a false null hypothesis .
It is the probability that the investigator will conclude that no relationship exists between independent and dependent variables when such relationship does exist. It is represented by the lowercase Greek letter beta. Consequently, if you know the probability of success on any given trial, binomial distributions can be used to predict probabilities of given numbers of successes in given numbers of trials. This means that a researcher can determine whether an empirical distribution deviates significantly from what would typically be expected. A box plot or box and whiskers plot is a graphical way of representing the salient features of a distribution.