Critical Value
A critical value is used in
significance testing. It is the value that a test
statistic must exceed in order
for the the null
hypothesis to be
rejected. For example, the critical value of
t (with 12
degrees of freedom using the 0.05 significance
level) is 2.18. This means that
for the probability
value to be less than or
equal to 0.05, the absolute value of the t statistic must be
2.18 or greater. It should be noted that the all-or-none rejection of a null hypothesis is not
recommended.
It should be noted that the all-or-none rejection of a null hypothesis is not
recommended.