An ad agency tracks the complaints, by week received, about the billboards in its city

An ad agency tracks the complaints, by week received, about the billboards in its city:

a) What type of control chart would you use to monitor this process? Why?

b) What are the 3-sigma control limits for this process? Assume that the historical complaint rate is unknown.

c) Is the process in control, according to the control limits? Why or why not?

d) Assume now that the historical complaint rate has been four calls a week. What would the 3-sigma control limits for this process be now? Has the process been in control according to the control limits?

Need accounting assignment help? We are the experts

S6.22 An ad agency tracks the complaints, by week received, about the billboards in its city: lim- bout WEEK NO. OF COMPLAINTS 4 e its their asty aire ther eal. days 4 4 6 9 a) What type of control chart would you use to monitor this pro- b) What are the 3-sigma control limits for this process? Assume c) Is the process in control, according to the control limits? Why d) Assume now that the historical complaint rate has been four cess? Why? that the historical complaint rate is unknown. or why not? calls a week. What would the 3-sigma control limits for this process be now? Has the process been in control according to the control limits? Px

Expert Answer

Answer to question a :

Choice of C hart will be the appropriate control chart to monitor this process.

C chart is used when counting total count of defects ( here that is ‘complaints’) per unit ( here that is ‘week)and is appropriate when the sample size is uniform . Here sample size for each case is “Week” and hence has an uniform sample size.

In case sample size was not uniform , c chart could not have been used and instead u chart would have been used.

Answer to question b :

Let , Cbar = Average number of complaints per week

Therefore, Cbar = ( 4 + 5 + 4 + 11 + 3 + 9) / 6 = 6

Thus 3 sigma control limits are :

Upper Control Limit ( UCL )

= Cbar + 3 x square root ( Cbar)

= 6 + 3x square root ( 6)

= 6 + 3 x 2.45

UPP

= 13.35

Centerline ( CL) =Cbar = 6

Lower control Limit ( LCL)

= Cbar – 3 x square root ( Cbar)

= 6 – 3 x 2.45

= 6 – 7.35

= – 1.35

However since derived result for CL is negative number, we must consider LCL = 0

3 SIGMA UPPER CONTROL LIMIT ( UCL ) = 13.35
CENTERLINE = 6
3 SIGMA LOWER CONTROL LIMIT ( LCL) = 0

Answer to question c:

The data on number of complaints are : 4. 5, 4 , 11, 3 and 9 . It can be seen that all these data are within UCL of 13.35 and LCL of 0 . Therefore, it can be concluded that the process is in control…

For complete answer, place your order at online assignment help

Place your Order and Get 25% Discount

Online Essay Writing Services

Cost of your order

Pages
{{total || ""}}

Why we are the best online essay assignment help service

Best Essay Writing Services

We make certain that all of your directions are followed to the letter. Select your academic level: high school, university/college, or professional, and an expert with the appropriate degree will be assigned to your essay.

Professional Academic Essay Writers with Years of Experience

We have a group of online essay writing experts boasting academic and corporate writing skills. Many are native speakers who can assist you with any essay.

Unlimited and Free Revisions

Submit your order for revision if you believe we missed something. After receiving the finished document, you get 10 days to send the order for evaluation. You can do this by signing into your private account or contact our customer service.

Money-back Guarantee and Quick Delivery

Essays are delivered on time. We may approach you about extending the deadline if we ever need extra time to perfect your essay. If you are unable to give us more time, a full refund is provided.

Confidential and Originality

We utilize a variety of plagiarism detection methods to verify that all of the materials you get are clear from plagiarism. All statements in the paper are carefully reviewed by our editors. In addition, we guarantee complete anonymity in our essay services.

24/7 Customer Care

Our customer service representatives are accessible 24 hours every day, seven days every week, and are dedicated to providing the best possible service. Please contact us when you need assistance.

Services

There's no need to finish your essay late at night. We can handle the essay as you sleep. We provide a wide range of online essay assignment help services.

Essay and assignment help

Online Essay Writing Help

You are allowed to select your educational level and essay type at affordable prices, regardless of what type of essay assignment you require or how urgently you need it. We handle all of your essay requirements and provide a customer service system that is available 24 hours a day, seven days a week..

Admission Essay

Admission and Personal statement

An admission essay is a written statement submitted by an applicant, most commonly a prospective student applying to a college or university. You can rest assured that we will produce a quality admission essay..

Essay Editing

Proofreading and Essay Editing

Our professional essay writers and editors polish your document by making the essential modifications. We also structure your document by citing sources accurately and providing reference lists in APA, Harvard, MLA, Chicago / Turabian, and other formats..

Revisions

Revision/Improve my essay

You can request a review if you believe your essay can be better. Your essay will be reviewed by the expert or handed to an editor. This option can be used as many times as you want. This is provided without extra charges since we want you to be entirely satisfied..