Problem 1. The Watson Electric Company produces incandescent light bulbs. The following data on the number of lumens for 40-watt light bulbs were collected when the process was in control. Sample 1 2 3 4 1 614 602 598 600 2 597 601 590 606 3 581 603 585 599 4 620 605 595 588 5 595 609 608 604
a) (15 points) Calculate the control limits for an R-chart. b) (15 points) Calculate the control limits for an x-bar -chart. c) (10 points) Since these data were collected, some new employees were hired. A new sample obtained the following readings: 575, 603, 623 and 583. Is the process still in control? (hint: use the original sample set as a benchmark to assess the new sample)
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.Read more
Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.Read more
Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.Read more
Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.Read more
By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.Read more