Refer to Exercise 5. 

True or false:

a. If the proportion of defectives in the sample is less than 12%, it is reasonable to conclude that the new process is better.

b. If the proportion of defectives in the sample is only slightly less than 12%, the difference could well be due entirely to sampling variation, and it is not reasonable to conclude that the new process is better.

c. If the proportion of defectives in the sample is a lot less than 12%, it is very unlikely that the difference is due entirely to sampling variation, so it is reasonable to conclude that the new process is better.