Acertain process for manufacturing integrated circuits has been in use for a period of time, and it is known that 12% of
the circuits it produces are defective. a new process that is supposed to reduce the proportion of defectives is being
tested. in a simple random sam-ple of 100 circuits produced by the new process, 12 were defective.
a. one of the engineers suggests that the test proves that the new process is no better than the old process, since the
proportion of defectives in the sample is the same. is this conclusion justied? explain.
b. assume that there had been only 11 defective circuits in the sample of 100. would this have proven that the new
process is better? explain.
c. which outcome represents stronger evidence that the new process is better: nding 11 defective circuits in the sample,
or nding 2 defective circuits in the sample?