Question
In: Operations Management
QC.56 Thirst, an IBC company, wants to serve their customers within a consistent, reasonable amount of...
QC.56 Thirst, an IBC company, wants to serve their customers within
a consistent, reasonable amount of time. On each day during their
second week of business (5 days total) they randomly timed the wait
time of 12 different customers (per day). The table below contains
the average wait time (in seconds) for each of these days as well
as the minimum and maximum wait times for each day:
| Day | Avg Wait | Min Wait | Max Wait |
| 1 | 69 | 63 | 73 |
| 2 | 76 | 69 | 83 |
| 3 | 73 | 68 | 81 |
| 4 | 79 | 71 | 88 |
| 5 | 71 | 61 | 78 |
Using this information (above) and the table at the top of this
problem (Factors for Control Charts), set up an x-bar chart and an
r-chart.
Hint: Answer the following questions to help you gather the
necessary data to complete these problems.
- Is a target wait time given? If not, then you should calculate the sample mean (average of the average times) and use that as the target wait time.
- Do you know what the range is for the wait times each day (the
difference between the minimum and maximum times)? How about the
average range across all days?
What is the upper control limit for the x-bar
chart? (Display your answer to two decimal
places.
What is the lower control limit for the x-bar
chart? (Display your answer to two decimal
places.)
What is the upper control limit for the r-chart?
(Display your answer to two decimal places.)
What is the lower control limit for the r-chart?
(Display your answer to two decimal places.)
Solutions
Expert Solution
Below is the screenshot of the formula applied -
Below is the screenshot of the result -
From above -
What is the upper control limit for the x-bar
chart - 77.38
What is the lower control limit for the x-bar
chart - 69.82
What is the upper control limit for the r-chart-
24.38
What is the lower control limit for the r-chart -
4.02
keosha answered 2 days agoRelated Solutions
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