6.1. In Example 6.1, Village Volvo wants to test the results of the QFD exercise for sensitivity
to changes in the relative importance of customer expectations. Recalculate the
weighted scores for the QFD exercise when customer expectations are given equal
relative importance (e.g., five). Has this changed the previous recommendation to
focus on training?
6.2. In Example 6.2, the ambulance supervisor now has decided to double the response
time sample size to 8 calls per day. Calculate the new UCL and LCL for a revised
X -chart. For the next week, you record the following sample of daily mean response
times: 5.2, 6.4, 6.2, 5.8, 5.7, 6.3, and 5.6. Would you be concerned?
6.3. The time to make beds at a motel should fall into an agreed-on range of times. A
sample of four maids was selected, and the time needed to make a bed was observed
on three different occasions:
Service Time, Sec.
Maid Sample 1 Sample 2 Sample 3
Ann 120 90 150
Linda 130 110 140
Marie 200 180 175
Michael 165 155 140
a. Determine the upper and lower control limits for an X -chart and an R -chart with
a sample size of four.
b. After the control chart was established, a sample of four observations had the following
times in seconds: 185, 150, 192, and 178. Is corrective action needed?
Place this order with us and get 18% discount now! to earn your discount enter this code: summer17 If you need assistance chat with us now by clicking the live chat button.