Question: Manufacturing and Product Development Blenko Specs has two different processes for the manufacture of optical lenses supplied to the military. A random sample of finished lenses was obtained from each process, and each lens was carefully inspected for defects. Of the 106 lenses from Process A, eight were defective, and 12 of the 121 lenses from Process B were defective.
a. Compute the sample proportion of defectives for each process.
b. Check the nonskewness criterion and verify that the inequalities are satisfied.
c. Conduct a hypothesis test to determine whether there is any evidence that the sample proportion of defective lenses is different for Process A and Process B. Use a = 0.05.