Question

A hospital is using X bar and R charts to record the time it takes to process account information. A sample of five applications is taken each day. The first four weeks’ (20 days’) data give the following values: X-double bar= 17 min, R bar = 7 min. If the upper and lower specification limits are 21 minutes and 13 minutes respectively, calculate Cp and Cpk. Interpret the indices

Answer #1

**Given values:**

X-double bar= 17 minutes

R-bar = 7 minutes

Upper specification limit (USL) = 21 minutes

Lower specification limit (LSL) = 13 minutes

**Solution:**

Cp is calculated as;

Cp = (USL - LSL) / 6

Standard deviation, sigma = R-bar / d2

From 3-sigma control limits charts, for n = 5 (sample size of 5 application), d2 = 2.326

sigma = 7 / 2.326

sigma = 3.009

Cp = (USL - LSL) / 6

Cp = (21 - 13) / (6 x 3.009)

**Cp = 0.443**

Cpk is calculated as;

Cpk = Minimum of [(USL - X-double bar)/ 3] and [(X-double bar - LSL)/ 3]

Cpk = Minimum of [(21 - 17)/ (3 x 3.009)] and [(17 - 13)/ (3 x 3.009)]

Cpk = Minimum of (0.443) and (0.443)

**Cpk = 0.443**

Since, both Cp and Cpk is below the
desired value of 1.33 for the two-sided specification, the
**process is not capable.**

A Quality analyst is checking the process capability associated
with the production of struts, specifically the amount of torque
used to tighten the fastener. Twenty five samples of size 4 have
been taken. These were used to create X bar and R charts. The
values for these charts are as follows: The upper and lower control
limits for the X-bar chart are 75 Nm and 72.16 Nm respectively. X
double bar is 73.58 Nm, R bar is 1.66. The specification...

ProCycle & Co. uses X bar and R-charts to track the
thickness of bicycle brake pads in millimeters. Below are the
observations for 5 samples. What are the UCLR ,
LCLR (for range) and X bar (double bar)?
Sample
Observation 1
Observation 2
Observation 3
1
22
14
12
2
24
17
18
3
19
20
21
4
16
13
15
5
10
10
13
Group of answer choices
7.722: 0: 81.34
9.575: 0: 81.34
7.222: 0: 81.34
12.87; 0:...

3.53 The time from when a patient is discharged from North Shore
Hospital to the time the discharged patient’s bed is ready to be
assigned to a new patient is referred to as the bed assignment
turnaround time. If the bed turnaround time is excessive, it can
cause problems with patient flow and delay medical procedures
throughout the hospital. This can cause long waiting times for
physicians and patients, thus creating customer dissatisfaction.
The admissions RN has assigned a patient...

Based on your recommendations, Mr. Miller improved shop
operations and successfully reduced the number of customer
complaints. To maintain good service, Mr. Miller asked you to keep
monitoring the wait times of oil change customers
at the shop.
First, you decide to create an x-bar chart to
monitor the central tendency (i.e., mean). But you know that we
sometimes overlook a problem if we use only an x-bar chart.
Therefore, you decide to create an R-chart to
monitor the process...

Please compute the value, upper control limit, and lower
control limit for the x-bar chart, r-bar chart, p
chart, and np chart.
Sample #
Observations
Defects
1
44
49
44
44
40
0
2
42
46
51
51
42
2
3
45
45
49
49
46
2
4
40
39
42
42
47
7
5
44
51
53
53
44
2
6
41
44
43
43
46
8
7
40
44
46
46
48
3
8
54
49
48
48...

What tools could AA leaders have used to increase their
awareness of internal and external issues?
???ALASKA AIRLINES: NAVIGATING CHANGE
In the autumn of 2007, Alaska Airlines executives adjourned at
the end of a long and stressful day in the
midst of a multi-day strategic planning session. Most headed
outside to relax, unwind and enjoy a bonfire
on the shore of Semiahmoo Spit, outside the meeting venue in
Blaine, a seaport town in northwest
Washington state.
Meanwhile, several members of...

Delta airlines case study
Global strategy. Describe the current global
strategy and provide evidence about how the firms resources
incompetencies support the given pressures regarding costs and
local responsiveness. Describe entry modes have they usually used,
and whether they are appropriate for the given strategy. Any key
issues in their global strategy?
casestudy:
Atlanta, June 17, 2014. Sea of Delta employees and their
families swarmed between food trucks, amusement park booths, and
entertainment venues that were scattered throughout what would...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 3 minutes ago

asked 13 minutes ago

asked 30 minutes ago

asked 34 minutes ago

asked 42 minutes ago

asked 43 minutes ago

asked 48 minutes ago

asked 57 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago