Control charts on and s are to be maintained on the torque readings of a earing used in a wingflap actuator assembly. Samples of size n = 10 are to be used, and we know from past experience that when the process is in control, bearing torque has a normal distribution with mean µ = 80 inch-pounds and standard deviation of = 10 inch pounds. Find the center line and control limits for these control charts.
Answer to relevant QuestionsSamples of n = 6 items each are taken from a process at regular intervals. A quality characteristic is measured, and x and R values are calculated for each sample. After 50 samples, we have Assume that the quality ...Reconsider the data presented in Exercise 6.21. (a) Rework both parts (a) and (b) of Exercise 6.21 using the x and s charts. (b) Does the s chart detect the shift in process variability more quickly than the R chart did ...Control chart x and s for are maintained on a process. After 25 preliminary subgroups each of size 3 are evaluated, you have the following data: (a) Set up control charts using these data. (b) Assume that the process ...Suppose that following the construction of the x and R control charts in Exercise 6.34, the process engineers decided to change the subgroup size to n = 2. Table 6E.16 contains 10 new subgroups of thickness data. Plot this ...Two parts are assembled as shown in Figure 6.28. Assume that the dimensions x and y are normally distributed with means x and y and standard deviations x and y, respectively. The parts are produced on different ...
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