A certain process for manufacturing CPUs has been in use for a period of
time, and it is known that 12% of the CPUs it produces are defective. A new process that is
supposed to reduce the proportion of defectives is being tested. In a simple random sample of
100 CPUs 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 justified? Explain.
b. Assume that there had been only 11 defective CPUs in the sample of 100. Would this
have proven that the new process is better? Explain.
c. Which outcome represents strong evidence that the new process is better: finding 11
defective CPUs or finding 2 defective CPUs?
Mathbot Says...
I wasn't able to parse your question, but the HE.NET team is hard at work making me smarter.