Question: Compare the ANOVA table in Exercise 3 with the ANOVA table in Exercise 1. Would you recommend leaving the balance powered up continuously? Explain your

Compare the ANOVA table in Exercise 3 with the ANOVA table in Exercise 1.

Would you recommend leaving the balance powered up continuously? Explain your reasoning.

It turned out that the measurements made by operator B were taken shortly after the balance had been powered up, while the others were taken after the balance had been powered up for some time. A new policy was then instituted to leave the balance powered up continuously. The three operators then made two weighings of three different wafers. The results are presented in the following table. Operator A Operator B Operator C Wafer 1 11 15 10 6

Operator A Operator B Operator C Wafer 1 11 15 10 6 14 10 Wafer 2 210 208 205 201 208 207 Wafer 3 111 113 102 105 108 111

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