In-class Assignment: Statistical Control Part A The Watson Electric Company produces incandescent lightbulbs. The following data on the number of lumens for 40-watt light bulbs were collected when the process was in control. Observation Sample 1 2 3 4 1 2 3 604 612 597 601 581 570 620 605 590 614 588 600 607 603 585 592 595 588 608 604 4 5 1. Calculate the upper and lower control limits for an T-chart. 2. Since these data were collected, some new employees were hired. A new sample ob- tained the following readings: 570, 603, 623, and 583. Is the process still in control