For a production process using statistical process control, where each sample has 4 observations in it, let  = 9.35 inches and = 3 inches. What is the lower control limit for the -chart?单项选择题

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Construct a 3-sigma x-bar chart for the length in centimeters of a part from the following table. What is the upper control limit? Sample # Observation 1 Observation 2 Observation 3 Observation 4 1 0.486 0.499 0.493 0.511 2 0.499 0.506 0.516 0.494 3 0.496 0.5 0.515 0.488 4 0.495 0.506 0.483 0.487 5 0.472 0.502 0.526 0.469 6 0.473 0.495 0.507 0.493 7 0.495 0.512 0.49 0.471 8 0.525 0.501 0.498 0.474 9 0.497 0.501 0.517 0.506 10 0.495 0.505 0.516 0.511

Question at position 6  Enrique manufactures earrings at his factory in Dublin, OH. He is trying to determine if there is a bottleneck in his welding department that may be slowing down his production of diamond nose rings. To determine if there is a delay Enrique has recorded data from 3 separate days and taken 3 random readings of how long each earring takes (in seconds) to be welded (see table). Calculate the X-bar-bar of the welding process in the earring factory. (round your answer to 2 decimal places) [table] Sample/Day | Day 1 | Day 2 | Day 3 1 | 13.24 | 13.89 | 13.76 2 | 12.56 | 11.98 | 12.34 3 | 15.01 | 14.33 | 12.39 [/table] Answer Enrique manufactures earrings at his factory in Dublin, OH. He is trying to determine if there is a bottleneck in his welding department that may be slowing down his production of diamond nose rings. To determine if there is a delay Enrique has recorded data from 3 separate days and taken 3 random readings of how long each earring takes (in seconds) to be welded (see table). Calculate the X-bar-bar of the welding process in the earring factory. (round your answer to 2 decimal places) [table] Sample/Day | Day 1 | Day 2 | Day 3 1 | 13.24 | 13.89 | 13.76 2 | 12.56 | 11.98 | 12.34 3 | 15.01 | 14.33 | 12.39 [/table] [input]

Project A has a required return on 9.2 percent and cash flows of −$87,000, $32,600, $35,900, and $43,400 for Years 0 to 3, respectively. Project B has a required return of 12.7 percent and cash flows of −$85,000, $14,700, $21,200, and $89,800 for Years 0 to 3, respectively. Which project(s) should you accept based on net present value if the projects are mutually exclusive?

You are considering two mutually exclusive projects. Project A has cash flows of −$72,000, $21,400, $22,900, and $56,300 for Years 0 to 3, respectively. Project B has cash flows of −$81,000, $20,100, $22,200, and $74,800 for Years 0 to 3, respectively. Both projects have a required 2.5-year payback period. Should you accept or reject these projects based on payback analysis?

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