Testing of hypothesis is a statistical procedure used to decide whether to reject or accept a claim about a population parameter based on a sample. The key steps are: 1) Formulate the null and alternative hypotheses 2) Choose a significance level, typically 5% 3) Select the appropriate test statistic and critical region based on the hypotheses and test distribution 4) Calculate the test statistic and compare to the critical region 5) Reject the null hypothesis if the test statistic falls in the critical region