# Question: A machine has four heads Samples of n 3 units

A machine has four heads. Samples of n= 3 units are selected from each head, and the x and R values for an important quality characteristic are computed. The data are shown in Table10E.4. Set up group control charts for this process.

## Answer to relevant Questions

Consider the group control charts constructed in Exercise 10.5. Suppose the next ten samples are in Table 10E.5. Plot the new data on the control charts and discuss your findings. Suppose that we have p= 4 quality characteristics, and in correlation form all four variables have variance unity and all pairwise correlation coefficients are 0.7. The in-control value of the process mean vector is u’ = ...Suppose that there are p = 2 quality characteristics, and in correlation form both variables have variance unity and the correlation coefficient is 0.8. The in-control value of the process mean vector is μ′ = [0, 0], and ...Reconsider the situation in Exercise 11.2. Suppose that the sample mean vector and sample covariance matrix provided were the actual population parameters. What control limit would be appropriate for phase II of the control ...Consider the data in Table 12.1. Construct a bounded adjustment chart using λ = 0.4 and L = 10. Compare the performance of this chart to the one in Table 12.1 and Fig. 12.12.Post your question