The article “Case Study Based Instruction of DOE and SPC”
Chapter 5, Problem 8E(choose chapter or problem)
The article “Case Study Based Instruction of DOE and SPC” (J. Brady and T. Allen, The American Statistician, 2002:312–315) describes an effort by an engi- neering team to reduce the defect rate in the manu- facture of a certain printed circuit board. The team decided to reconfigure the transistor heat sink. A total of 1500 boards were produced the week before the reconfiguration was implemented, and 345 of these were defective. A total of 1500 boards were produced the week after reconfiguration, and 195 of these were defective. Find a 95% confidence interval for the decrease in the defective rate after the reconfiguration.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer