Consider a quality characteristic, X, with specification 111.5 mm and this dimension in the finished goods is found to be normally distributed with standard deviation =0.3.

1. What is the quality level of a process?

2. If process mean, =11.45, is the process centered?

3. If process mean, =11.45 (1.5 shift), what is the percent defectives?

4. If process is centered, what will be the percent defectives?

If variation in X is reduced and the standard deviation is found to be =0.25,

5. What is the quality level now?

6. If process mean, =11.375, is the process centered?

7. If process mean, =11.375 (1.5 shift), what is the percent defectives?

8. If process is centered, what will be the percent defectives