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Solved: Lowering the thickness of an expensive blow-molded
Chapter 13, Problem 64E(choose chapter or problem)
Lowering the thickness of an expensive blow-molded container. Refer to the Quality (Mar. 2009) study of a plant produces a high-volume, blow-molded container, Exercise 13.33 (p. 13-40). Recall that the quality manager at the plant wants to lower the average thickness for the expensive layer of material and still meet specifications. Specification limits for individual thickness values are .10 to .30 millimeter.
a. Find the standard deviation of the process data.
b. Calculate the capability index, \(C_p\), for the process and interpret the result.
c. Compare the LCL of the process (from Exercise 13.33) to the LSL. Does this imply that the average thick-ness of the material can be lowered and still meet specifications?
Questions & Answers
QUESTION:
Lowering the thickness of an expensive blow-molded container. Refer to the Quality (Mar. 2009) study of a plant produces a high-volume, blow-molded container, Exercise 13.33 (p. 13-40). Recall that the quality manager at the plant wants to lower the average thickness for the expensive layer of material and still meet specifications. Specification limits for individual thickness values are .10 to .30 millimeter.
a. Find the standard deviation of the process data.
b. Calculate the capability index, \(C_p\), for the process and interpret the result.
c. Compare the LCL of the process (from Exercise 13.33) to the LSL. Does this imply that the average thick-ness of the material can be lowered and still meet specifications?
ANSWER:Step 1 of 9
We are given the data of change in carbon content of the produced nuggets was measured
at 4 hour intervals for 33 consecutive intervals.
According to the specifications for individual thick ness values are 0.10 and 0.30
millimeters.
That is
USL = 0.30
LSL = 0.10