The antivirus software, Norton, is in common use to treat computer viruses. A study investigated the effectiveness of this antivirus software on various types of computers. Researchers installed Norton on a MAC computer and a PC computer. After 14 days, they randomly assigned 72 viruses into two groups of 36, installed one group in each computer and recorded the number of viruses that were detected within 48 hours. On MAC, 18 viruses were detected. On PC, 25 were detected. a) Construct and interpret a 95% condence interval for the difference in the proportion of viruses that were detected on each computer. b) Based on this interval, do you think that the difference in the proportion of viruses detected on each computer is significant. Justify your