A hypothesis test consists of two complementary propositions. For example, suppose that the test is to see if a process mean differs from zero:
H_{0} the mean equals zero (this is the 'null hypothesis')
H_{1} the mean does not equal zero (this is the 'alternative hypothesis')
The test will determine the probability of getting the observed results if H_{0} were true. This probability is known as the pvalue.
Terms used in hypothesis testing include:
