To monitor the quality of pepperoni pizzas, a quality control manager collects random samples of pizzas and evaluates them. The process mean and standard deviation for the weight and diameter of pizzas are not known. Which of the following is a correct matching between the type of data collected and the choice of control chart used?
I. weighed the sampled pizzas and constructed a c-chart
II. rated the appearance of sampled pizzas as acceptable or unacceptable and then constructed a mean chart
III. measured the diameter of the sampled pizzas and constructed a range chart
IV. counted the number of pepperonis per sampled pizza and constructed a mean chart
Select one:
a. only IV
b. III and IV
c. I and IV
d. only III
e. none of the listed