1) Computation of the test statistic value. The test statistic value (also called the obtained value or observed value) is the result or product of a specific statistical calculation. For example, there are test statistics for the significance of the difference between the averages of two groups, for the significance of the difference of a correlation coefficient from zero, and for the significance of the difference between two proportions. You are tasked to compute the test statistic and come up with a numerical value.
2)Comparison of the obtained value with the critical value. This is the crucial step. Here, the value you obtained from the test statistic (the one you computed) is compared with the value (the critical value) you would expect to find by chance alone.