The article “Case Study Based Instruction of DOE and SPC” (J. Brady and T. Allen, The American Statistician. 2002:312–315) presents the result of a 24–1 factorial expertment to investigate the effects of four factors on the yield of a process that manufactures printed circuit boards. The factors were A: transistor power output (upper or lower specification limit). B: transistor mounting approach (screwed or soldered). C: transistor heat sink type (current or alternative configuration), and D: screw position on the frequency adjustor (one-half or two turns). The results are presented in the following table. The yield is a percent of a theoretical maximum.
- a. Estimale the main effccts of cach of the four faetors.
- b. Assuming all intcractions to be negligible, pool the sums of squares for interaction to use in place of an error sum of squares.
- c. Which of the four factors, if any. con you conclude to affect the yield? Whal is the P-value of thè relevanl test?
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