homework 3 answer all questions

At Quickie Car Wash, the wash process is advertised to take less than 6 minutes. Consequently, management has set a target average of 330 seconds for the wash process. Suppose the average range for a sample of 10 cars is 9 seconds. Use the accompanying table to establish control limits for sample means and ranges for the car wash process. Click the icon to view the table of factors for calculating three-sigma limits for the x-chart and R-chart. The UCLR equals seconds and the LCLR equals seconds. (Enter your responses rounded to two decimal places.) Garcia's Garage desires to create some colorful charts and graphs to illustrate how reliably its mechanics "get under the hood and fix the problem." The historic average for the proportion of customers that return for the same repair within the 30 -day warranty period is 0.11 . Each month. Garcia tracks 90 customers to see whether they return for warranty repairs. The results are plotted as a proportion to report progress toward the goal. If the control limits are to be set at three standard deviations on either side of the goal, determine the control limits for this chart. In March, 20 of the 90 customers in the sample group retumed for warranty repairs. Is the repair process in control? The UCLp equals and the LCLp equals (Enter your responses rounded to three decimal places.) Canine Gourmet Super Breath dog treats are sold in boxes labeled with a net weight of 12 ounces ( 340 grams) per box. Each box contains 8 individual 1.5-ounce packets. To reduce the chances of shorting the customer, product design specifications call for the packet-filling process average to be set at 43.0 grams so that the average net weight per box of 8 packets will be 344 grams. Tolerances are set for the box to weigh 34414 grams. The standard deviation for the packet-filling process is 1.02 grams. The target process capability ratio is 1.67 . One day, the packet-filling process average weight drifts down to 42.0grams. Is the packaging process capable? Is an adjustment needed? Since the process capability index, Cpk, is the process (Enter your response rounded to three decimal places.)