Define the null hypothesis:
The hypothesis that is assumed to be correct
Define the alternative hypothesis:
The parameters for your assumption being wrong
Define population parameter:
The population being tested
Define test statistic:
The result of the experiment
What is the critical region:
The range of values of test statistics that would cause the null hypothesis to be rejected
What is the critical value:
The first value INSIDE the critical region
What is the actual significance level:
The probability of incorrectly rejecting the null hypothesis