A manufacturer of chunky peanut butter has a quality control program to

monitor the number of peanut chunks in a one-pound jar. If there are too few chunks the

product can hardly be called "chunky". On the other hand, if there are too many chunks the

peanut butter becomes difficult to spread. The production process calls for a mean of 250

chunks per jar. If a random sample of 60 jars shows an average of 240 chunks and a standard

deviation of 40 chunks, should the production process be stopped for an adjustment? Test at

0.05.