10.125 [EX10-125] The quality of the end product is somewhat determined by the quality of the materials used. Textile mills monitor the tensile strength of the fibers used in weaving their yard goods. The following independent random samples are tensile strengths of cotton fibers from two suppliers.

Supplier A 78 82 85 83 77 84 90 82 93 82 80 82 77 80 80 Supplier B 76 79 83 78 72 73 69 80 74 77 78 78 73 76 78 79 Calculate the observed value of F, F, for comparing the variances of these two sets of data.