A procurement specialist has purchased 25 resistors from vendor 1 and 35 resistors from

Chapter 10, Problem 10-76

(choose chapter or problem)

A procurement specialist has purchased 25 resistors from vendor 1 and 35 resistors from vendor 2. Each resistors resistance is measured with the following results: Vendor 1 96.8 100.0 100.3 98.5 98.3 98.2 99.6 99.4 99.9 101.1 103.7 97.7 99.7 101.1 97.7 98.6 101.9 101.0 99.4 99.8 99.1 99.6 101.2 98.2 98.6 Vendor 2 106.8 106.8 104.7 104.7 108.0 102.2 103.2 103.7 106.8 105.1 104.0 106.2 102.6 100.3 104.0 107.0 104.3 105.8 104.0 106.3 102.2 102.8 104.2 103.4 104.6 103.5 106.3 109.2 107.2 105.4 106.4 106.8 104.1 107.1 107.7 1 2 /2 2 (a) What distributional assumption is needed to test the claim that the variance of resistance of product from vendor 1 is not significantly different from the variance of resistance of product from vendor 2? Perform a graphical procedure to check this assumption. (b) Perform an appropriate statistical hypothesis-testing procedure to determine whether the procurement specialist can claim that the variance of resistance of product from vendor 1 is significantly different from the variance of resistance of product from vendor 2.