AN ALTERNATIVE METHOD TO TEST FOR RANDOMNESS OF A PROCESS

The objective of this paper is to revisit an old technique for testing the randomness of a process. This method uses the mean square success ive difference approach to estimate variance, compares this estimate w ith the usual variance estimate, and tests whether the two variance es timates are significantly different. If the test result is significant , it is concluded that the process is not random (i.e. not in control) . The non-random results are addressed to accomplish quality improveme nt.