West Battery has recently been receiving complaints from retailers that its 9-volt batteries are not lasting as long as other name brands. James W. head of the TQM program at West’s Austin plant, believes there is no problem because his batteries have had an average life of 50 hours, about 10% longer than competitors’ models. To raise the lifetime above this level would require a new level of technology not available to West. Nevertheless, he is concerned enough to set up hourly assembly line checks. Previously, after ensuring that the process was running properly, West took size n=5 samples of 9-volt batteries for each of 25 hours to establish the standards for control chart limits. Those samples are shown in the companion Excel file named “Battery_TQM.xlsx” (attached). With these limits established, West now takes 5 more hours of data, which are shown in the same aforementioned Excel file.
a. Construct X-bar and R charts based on the data of the first 25 hours. Comment on whether the process is in control.
b. Based on the control charts established using the first 25 hours’ data, is the manufacturing process still in control during the recent 5 more hours?
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