Refer to Exercise 17. It turns out that the measurements of operator 2 were taken in the morning, shortly after the balance had been powered up. A new policy was 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.

a. Construct an ANOVA table. You may give ranges for the P-values.

b. Compare the ANOVA table in part (a) with the ANOVA table in part (a) of Exercise 17. Would you recommend leaving the balance powered up continuously? Explain your reasoning.

Refer to Exercise 17.

Each of three operators made two weighings of several silicon wafers. Results are presented in the following table for three of the wafers. All the wafers had weights very close to 54 g, so the weights are reported in units of μg above 54 g. (Based on the article ??Revelation of a Microbalance Warmup Effect,?? J. Buckner, B. Chin, et al., Statistical Case Studies for Industrial Process Improvement, SIAM-ASA, 1997:39??45.)

Wafer Operator 1 Operator 2 Operator 3 1 152 156 156 155 152 157 443 440 442 439 435 439 3 229 227 229 232 225 228