Reconsider the situation in Exercise 5.32. Suppose that the process mean and variance were unknown and had to be estimated from the data available from the m subgroups. What complications would this introduce in the calculations that you performed in Exercise 5.32?
Answer to relevant QuestionsWhat is meant by a process that is in a state of statistical control? The net weight (in oz) of a dry bleach product is to be monitored by x and R control charts using a sample size of n = 5. Data for 20 preliminary samples are shown in Table 6E.7. (b) Estimate the process mean and standard ...Samples of n = 4 items are taken from a process at regular intervals. A normally distributed quality characteristic is measured and x and s values are calculated for each sample. After 50 subgroups have been analyzed, we ...Samples of size n = 5 are taken from a manufacturing process every hour. A quality characteristic is measured, and x and R are computed for each sample. After 2 samples have been analyzed, we have The quality characteristic ...A TiW layer is deposited on a substrate using a sputtering tool. Table 6E.14 contains layer thickness measurements (in angstroms) on 20 subgroups of four substrates. (a) Setup x and R control charts on this process. Is the ...
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