Refer to Exercise 1.

a. To what value should the process mean be set to maximize the process capability?

b. Is it possible to make the process capability acceptable simply by adjusting the process mean? Explain.

c. When the process mean is adjusted to its optimum value, what value must be attained by the process standard deviation so that the process capability is acceptable?

d. When the process mean is adjusted to its optimum value, what value must be attained by the process standard deviation so that the process has six-sigma quality?

Refer to Exercise 1.

The thickness specification for aluminum sheets is 0.246–0.254 mm. Data from an X̅ chart, based on samples of size 6, that shows that the process is in control, yield values of X̅ = 0.248 and s̅ = 0.002.