The figures show that the normalized standard deviations associated with the
different samples of the same model are reasonably low except the samples from
Types D and E. As this is an issue more relevant to quality control of the products
than to the concept associated with RTI, the high degree of deviation seemed to
warrant more caution when we need to test these products. Overall, the normalized
standard deviations associated with the different samples of the same model are
within the boundary established by the normalized standard deviations associated
with a sample of the same model under the different test conditions. Thus, assigning