Question

A taxi company wants to do an annual review of its service by checking the number...

A taxi company wants to do an annual review of its service by checking the number of monthly complaints. The total number of complaints in each of the last 12 months were 15, 9, 13, 12, 9, 20, 8, 10, 16, 11, 18, and 3.

  1. If 3-sigma limits are used to construct a control chart (corresponding to 99.73 percent) calculate the upper control limit (UCL) and the lower control limit (LCL) of this control chart.                        

b. Examining the data and your constructed c chart what can you advise the manager of the taxi company i.e. is the process in control, heading out of control or already out of control? Briefly explain in no more than 1-2 sentences (60 words maximum).

Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

ANSWER:

(a)

Here we construct a c chart.

Let the number of complaints in each sample be denoted by ci, then we calculate the mean as

Hence the control limits are given by

(b)

It is evident that all the points fall within the control limits. Hence it can be said that the process is in control.

NOTE:: I HOPE YOUR HAPPY WITH MY ANSWER....***PLEASE SUPPORT ME WITH YOUR RATING...

***PLEASE GIVE ME "LIKE"...ITS VERY IMPORTANT FOR ME NOW....PLEASE SUPPORT ME ....THANK YOU

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
Inter State Moving and Storage Company is setting up a control chart to monitor the proportion...
Inter State Moving and Storage Company is setting up a control chart to monitor the proportion of residential moves that result in written complaints due to late delivery, lost items, or damaged items. A sample of 40 moves is selected for each of the last 12 months. The number of written complaints in each sample is 7, 9, 4, 9, 2, 6, 11, 8, 5, 5, 6, and 15. Click here for the Excel Data File Insert the mean proportion...
The following are quality control data for a manufacturing process at Kensport Chemical Company. The data...
The following are quality control data for a manufacturing process at Kensport Chemical Company. The data show the temperature in degrees centigrade at five points in time during a manufacturing cycle. Sample x R 1 95.72 1.0 2 95.24 0.9 3 95.18 0.7 4 95.42 0.4 5 95.46 0.5 6 95.32 1.1 7 95.40 0.9 8 95.44 0.3 9 95.08 0.2 10 95.50 0.6 11 95.80 0.6 12 95.22 0.2 13 95.58 1.3 14 95.22 0.6 15 95.04 0.8 16...
Problem 10-25 Resistors for electronic circuits are manufactured on a high-speed automated machine. The machine is...
Problem 10-25 Resistors for electronic circuits are manufactured on a high-speed automated machine. The machine is set up to produce a large run of resistors of 1,000 ohms each. Use Exhibit 10.13.      To set up the machine and to create a control chart to be used throughout the run, 15 samples were taken with four resistors in each sample. The complete list of samples and their measured values are as follows: Use three-sigma control limits. SAMPLE NUMBER READINGS (IN OHMS)...
BridgeRock is a major manufacturer of tires in the U.S.. The company had five manufacturing facilities...
BridgeRock is a major manufacturer of tires in the U.S.. The company had five manufacturing facilities where tires were made and another 20 facilities for various components and materials used in tires. Each manufacturing facility produced 10,000 tires every hour. Quality had always been emphasized at BridgeRock, but lately quality was a bigger issue because of recent fatal accidents involving tires made by other manufacturers due to tread separation. All tire manufacturers were under pressure to ensure problems did not...
A company collects 20 samples with 100 eggs in each sample. They want to construct a...
A company collects 20 samples with 100 eggs in each sample. They want to construct a P chart to track the proportion of broken eggs in each sample. The table below shows the number of defective eggs per sample. Sample Eggs 1 3 2 5 3 3 4 4 5 2 6 4 7 2 8 6 9 4 10 9 11 2 12 6 13 5 14 1 15 5 16 0 17 2 18 6 19 2 20...
Each value represents the number of mistakes (defects) found on a student loan application. Values for...
Each value represents the number of mistakes (defects) found on a student loan application. Values for 50 consecutive loan applications are given. Calculate the appropriate centerline and 3-sigma control limits for the c-chart, and then plot the data and create a control chart. Does the process appear to be in a state of statistical control? Why or why not? Upper control limit (UCL) = Centerline (CL) = Lower control limit (LCL) = Process in statistical control? Medical Devices Variables Sample...
What tools could AA leaders have used to increase their awareness of internal and external issues?...
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...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT