# Question: A control chart for nonconformities is maintained on a process

A control chart for nonconformities is maintained on a process producing desk calculators. The inspection unit is defined as two calculators. The average number of nonconformities per machine when the process is in control is estimated to be two.

u = average # nonconformities/calculator =2

(a) Find the appropriate three-sigma control limits for this size inspection unit.

(b) What is the probability of type I error for this control chart?

u = average # nonconformities/calculator =2

(a) Find the appropriate three-sigma control limits for this size inspection unit.

(b) What is the probability of type I error for this control chart?

## Answer to relevant Questions

A production line assembles electric clocks. The average number of nonconformities per clock is estimated to be 0.75. The quality engineer wishes to establish a c chart for this operation, using an inspection unit of six ...Reconsider the insurance claim data in Table 7E.1. Set up an np control chart for this data and plot the data from Table 7E.1 on this chart. Compare this to the fraction nonconforming control chart in Exercise 7.3. In Table ...The weights of nominal 1-kg containers of a concentrated chemical ingredient are shown in Table 8E.2. Prepare a normal probability plot of the data and estimate process capability. Does this conclusion depend on process ...The molecular weight of a particular polymer should fall between 2,100 and 2,350. Fifty samples of this material were analyzed with the results x = 2,275 and s = 60. Assume that molecular weight is normally distributed. (a) ...The data in Table 8E.11 were taken by one operator during a gauge capability study. (a) Estimate gauge capability. b) Does the control chart analysis of these data indicate any potential problem in using the gauge?Post your question