# Question: A high level voltage power supply should have a nominal output

A high-level voltage power supply should have a nominal output voltage of 350 V. A sample of four units is selected each day and tested for process-control purposes. The data shown in Table 6E.3 give the difference between the observed reading on each unit and the nominal voltage times ten; that is,

xi =(observed voltage on unit i–350)10

(a) Set up x and R charts on this process. Is the process in statistical control?

(b) If specifications are at 350 V 5 V, what can you say about process capability?

(c) Is here evidence to support the claim that voltage is normally distributed?

xi =(observed voltage on unit i–350)10

(a) Set up x and R charts on this process. Is the process in statistical control?

(b) If specifications are at 350 V 5 V, what can you say about process capability?

(c) Is here evidence to support the claim that voltage is normally distributed?

**View Solution:**## Answer to relevant Questions

In the semiconductor industry, the production of microcircuits involves many steps. The wafer fabrication process typically builds these microcircuits on silicon wafers, and there are many microcircuits per wafer. Each ...Based on the data in Table 7E.8 if an np chart is to be established, what would you recommend as the center line and control limits? Assume that n = 500. A process is controlled with a fraction nonconforming control chart with three-sigma limits, n = 100, UCL = 0.161, center line = 0.080, and LCL = 0. (a) Find the equivalent control chart for the number nonconforming. (b) Use ...Consider the control chart in Exercise 7.26. Find the average run length if the process fraction nonconforming shifts to 0.20. A fraction nonconforming control chart has center line 0.01, UCL = 0.0399, LCL = 0, and n = 100. If three-sigma limits are used, find the smallest sample size that would yield a positive lower control limit.Post your question