A shirt manufacturer buys cloth by the 100-yard roll from a supplier. For setting up a control chart to manage the irregularities (e.g., loose threads and tears), the following data were collected from a sample provided by the supplier.
SAMPLE 1 2 3 4 5 6 7 8 9 10
IRREGULARITIES 6 4 3 4 5 5 6 2 4 6
a. Determine the C , Sp, UCL and LCL for a c -chart with z = 2. (Leave no cells blank. Round up any negative LCL value to “0”. Round your answers to 2 decimal places.)
b. Suppose the next five rolls from the supplier had two, two, five, three, and eight irregularities. Is the supplier process under control?
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