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:
