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Example 10.2 From past experience, it is known that one manufacturing process produces 1% defectives. Recently, some structural changes were made to the design of the process. Any reduction in percent defectives as a result is a welcome change, how ever, any increase in percent defectives is undesirable and requires immedinte attention. Identify the parameter of interest and formulate a pair of hypotheses to be tested Example 10.3 A machine is cutting rods with mean diameter 5 mn and variance 0.5 mm? Some adjustments are made to the process with the intention of improving the precision of the cutting process. What is the parameter of interest and what null and alternat tive hypotheses should be tested to check whether the adjustments have been effec- tive in reducing variation in diameters