AutoSave OFF w SPC Homework - new - Compatibility Mode a Home Insert Draw Design Layout References Mailings Review View Tell me Share Comments X Times New... v 12 v Ai Aa v v I AaBb CcDdi AaBbCcDdE AaBbCcDdE E > Paste B U X V ab X A ev Av Normal Heading 1 No Spacing Dictate Sensitivity Editor V V Styles Pane v 1. Wait time (hrs) at the DMV is monitored using a mean and a range chart. Five samples of n=15 observations have been obtained and the sample means and ranges computed: ' Sample 1 2 3 4 5 Mean 1.73 2.56 1.24 0.53 0.79 Range 0.48 0.37 0.41 0.46 0.49 a) Determine upper and lower limits for mean and range charts. b) Is the process in control? 2. Computer upgrades have a nominal time of 45 minutes. Samples of 5 observations each have been taken, and the results are as listed. Determine upper and lower control limits for mean and range charts, and decide if the process is in control. 1 45.8 43.3 45.1 45.2 44.9 2 44.8 44.8 43.1 45.3 45.4 3 44.7 44.1 43.9 43.2 43.5 4 45.9 45.8 40.2 43.1 44.5 5 43.8 44.9 45.1 45.6 44.4 6 45.8 43.3 45.1 43.8 44.9 3. Using samples of 200 credit card statements, an auditor found the following: Sample # of Errors 1 7 2 3 3 4 11 9 5 6 a) Determine the fraction defective in each sample b) What is your estimate of the mean and standard deviation of the sampling distribution of fractions defective for samples of this size? c) What are the upper and lower control limits for this process? Page 1 of 3 540 words X English (United States) Focus 100%