In this study, the statistical analysis carried out is similar to work done by Ahmad (1992). In order to compare the standard deviations (or variances) of the methods of measurement used in the study, a statistical testing procedure was carried out. The statistical procedure is known as Variance Ratio Test. In this study the variance ratio test will be used in order to find out whether there is any significant difference in the performance of the method used in the study. This can enable the user to find out whether or not the method came from same populations with the same variance by comparing the variance of any two samples of the methods used. From the outcome of the test, if the two samples come from the same population then they can be considered similar.