Question: 17.5 Consider the data of Table 17.1. Suppose that additional samples of size 5 are taken and tensile strength recorded. The sampling produces the following

17.5 Consider the data of Table 17.1. Suppose that additional samples of size 5 are taken and tensile strength recorded. The sampling produces the following results (in pounds per square inch).

Sample ¯X R 1 1511 22 2 1508 14 3 1522 11 4 1488 18 5 1519 6 6 1524 11 7 1519 8 8 1504 7 9 1500 8 10 1519 14

(a) Plot the data, using the ¯X - and R-charts for the preliminary data of Table 17.1.

(b) Does the process appear to be in control? If not, explain why.

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