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Understanding Business Statistics 1st edition Stacey Jones, Tim Bergquist, Ned Freed - Solutions
Open EndRunGuide. pdf, the EndRun Financial Services “ Guide to Investing.” Reexamine EndRun’s supporting data for the “More Winners Than Losers” and “The Big Eight Difference” and then answer the following:1. Can descriptive measures be computed for any variables? How would such
Open EndRunGuide. pdf, the EndRun Financial Services “ Guide to Investing,” and read the information about the Guaranteed Investment Package ( GIP). Read the claims and examine the supporting data. Then answer the following questions:1. How accurate is the claim of the probability of success
Open BullsAndBears. pdf, a marketing brochure from EndRun Financial Services. Read the claims and examine the supporting data. Then answer the following:1. Are there any “ catches” about the claims the brochure makes for the rate of return of Happy Bull and Worried Bear funds?2. What subjective
Open MTL_ QRTStudy. pdf, which documents the work of a quality response team at MyTVLab. Read the internal report that documents the work of the team and their conclusions. Then answer the following:1. Can the collected data be approximated by the normal distribution?2. Review and evaluate the
Cereal Cheaters (CCACC) suspects that cereal companies, including Oxford Cereals, are cheating consumers by packaging cereals at less than labeled weights. Recently, the group investigated the package weights of two popular Oxford brand cereals. Open CCACC. pdf to examine the group’s claims and
Then answer the following questions:1. Are the supporting data consistent with ISPG’s claims? Perform an appropriate statistical analysis to confirm ( or discredit) the stated relationship between sales and the two independent variables of product shelf location and the presence of in- store
Open Triangle Sunflower. pdf and review the leasing agents’ proposal and supporting documents. Then answer the following questions:1. Should mean disposable income be used to predict sales based on the sample of 14 Sunflowers stores?2. Should the management of Sunflowers accept the claims of
Open and review ConciergeClass. pdf, an electronic brochure that describes the Concierge Class program and compares it to the T. C. Resorts program. Then answer the following questions:1. Are the claims made by SunLow valid?2. What analyses of the survey data would lead to a more favorable
The following data were collected on non conformances for a period of 10 days:a. On what day is the proportion of nonconformances largest? Smallest? b. What are the LCL and UCL? c. Are there any special causes of variation?
The following data were collected on the number of nonconformities per unit for 10 time periods:a. Construct the appropriate control chart and determine the LCL and UCL. b. Are there any special causes of variation?
The following data were collected on the number of nonconformities per unit for 10 time periods:a. Construct the appropriate control chart and determine the LCL and UCL. b. Are there any special causes of variation?
To improve service quality, the owner of a dry cleaning business has the business objective of reducing the number of dry cleaned items that are returned for rework per day. Records were kept for a four week period (the store is open Monday through Saturday), with the results given in the following
The branch manager of a saving bank has recorded the number of error of a particular type that each of 12 tellers has made during the past year. The results (stored in teller) are as follows:a. Do you think the bank manager will single out Gina for any disciplinary action regarding her performance
Falls are one source of preventable hospital injury. Although most patients who fall are not hurt, a risk of serious injury is involved. The data in Pt Falls represent the number of patient falls per month over a 28 month period in a 19 bed AIDS unit at a major metropolitan hospital. a. Construct a
A member of the volunteer fire department for Trenton, Ohio, decided to apply the control chart methodology he learned in his business statistics class to data collected by the fire department. He was interested in determining whether weeks containing more than the mean number of fire runs were due
Rochester Electro Medical Inc. is a manufacturing company based in Tampa, Florida, that produces medical products. Management had the business objective of improving the safety of the workplace and began a safety sampling study. The following data (stored in Safety) represent the number of unsafe
For subgroups of n = 4, what is the value of a. the d2 factor? b. the d3 factor? c. the D3 factor? d. the D4 factor? e. the A2 factor?
For subgroups of n = 3, what is the value of a. the d2 factor? b. the d3 factor? c. the D3 factor? d. the D4 factor? e. the A2 factor?
The following data were collected on nonconformances for a period of 10 days:a. On what day is the proportion of nonconformances largest? Smallest? b. What are the LCL and UCL? c. Are there any special causes of variation?
The following summary of data is for subgroups of n = 3 for a 10 day period:a. Compute control limits for the range. b. Is there evidence of special cause variation in (a)? c. Compute control limits for the mean. d. Is there evidence of special cause variation in (c)?
The following summary of data is for subgroups of n = 4 for a 10 day period:a. Compute control limits for the range. b. Is there evidence of special cause variation in (a)? c. Compute control limits for the mean. d. Is there evidence of special cause variation in (c)?
of a branch of a local bank has the business objective of reducing the waiting times of customers for teller service during the 12: 00 noon to 1: 00 p. m. lunch hour. A subgroup of four customers is selected (one at each 15 minute interval during the hour), and the time, in minutes, is measured
The manager of a warehouse for a telecommunications company is involved in a process that receives expensive circuit boards and returns them to central stock so that they can be reused at a later date. Speedy processing of these circuit boards is critical in providing good service to customers and
An article in the Mid American Journal of Business presents an analysis for a spring water bottling operation. One of the characteristics of interest is the amount of magnesium, measured in parts per million (ppm), in the water. The data in the table on the next page (stored in SpWater) represent
The data in Tensile represent the tensile strengths of bolts of cloth. The data were collected in subgroups of three bolts of cloth over a 25 hour period. a. Construct a control chart for the range. b. Construct a control chart for the mean. c. Is the process in control?
The director of radiology at a large metropolitan hospital has the business objective of improving the scheduling in the radiology facilities. On a typical day, 250 patients are transported to the radiology department for treatment or diagnostic procedures. If patients do not reach the radiology
A filling machine for a tea bag manufacturer produces approximately 170 tea bags per minute. The process manager monitors the weight of the tea placed in individual bags. A subgroup of n = 4 tea bags is taken every 15 minutes for 25 consecutive time periods. The results are stored in Tea3. a. What
A manufacturing company makes brackets for bookshelves. The brackets provide critical structural support and must have a 90 degree bend ± 1 degree. Measurements of the bend of the brackets were taken at 18 different times. Five brackets were sampled at each time. The data are stored in Angle.a.
For an in control process with subgroup data n = 4, X-bar = 20, and R-bar = 2, find the estimate of a. The population mean of all X values. b. The population standard deviation of all X values.
A medical transcription service enters medical data on patient files for hospitals. The service has the business objective of improving the turnaround time (defined as the time between sending data and the time the client receives completed files). After studying the process, it was determined that
For an in control process with subgroup data n = 3, X-bar = 100, and R-bar = 3.386, compute the percentage of outcomes within specifications if a. LSL = 98 and USL = 102. b. LSL = 93 and USL = 107.5. c. LSL = 93.8 and there is no USL. d. USL = 110 and there is no LSL.
For an in control process with subgroup data n = 3, X-bar = 100, and R-bar = 3.386, compute the Cp, CPL, CPU, and Cpk if a. LSL = 98 and USL = 102. b. LSL = 93 and USL = 107.5.
Refering to the data of Problem 14.24, stored in SpWater , the researchers stated, “ Some of the benefits of a capable process are increased customer satisfaction, increased operating efficiencies, and reduced costs.” To illustrate this point, the authors presented a capability analysis for a
Refer to the data in Problem 14.25 concerning the tensile strengths of bolts of cloth (stored in Tensile). There is no USL for tensile strength, and the LSL is 13.a. Estimate the percentage of bolts that are within specifications.b. Calculate the Cpk and CPL.
Refer to Problem 14.27 concerning a filling machine for a tea bag manufacturer (data stored in Tea3). In that problem, you should have concluded that the process is in control. The label weight for this product is 5.5 grams, the LSL is 5.2 grams, and the USL is 5.8 grams. Company policy states that
Refer to Problem 14.22 concerning waiting time for customers at a bank (data stored in Bank Time). Suppose management has set a USL of five minutes on waiting time and specified that at least 99% of the waiting times must be less than five minutes in order for the process to be considered
What is the difference between common cause variation and special cause variation?
Under what circumstances do you use a p chart?
The following data (stored in Canister) represent the findings from a study conducted at a factory that manufactures film canisters. For 32 days, 500 film canisters were sampled and inspected. The following table lists the number of defective film canisters (the nonconforming items) for each day
What principles did you learn from the red bead experiment?
What is the difference between process potential and process performance?
A company requires a Cpk value of 1 or larger. If a process has Cp = 1.5 and Cpk = 0.8, what changes should you make to the process?
Accounting to the American Society for Quality, customers in the United States consistently rate service quality lower than product quality. For example, products in the beverage, personal care, and cleaning industries, as well as the major appliance sector all received very high customer
Suppose that you have been hired as a summer intern at a large amusement park. Every day, your task is to conduct 200 exit interviews in the parking lot when customers leave. You need to construct questions to address the cleanliness of the park and the customers’ intent to return. When you begin
Researchers at Miami University in Oxford, Ohio, investigated the use of p charts to monitor the market share of a product and to document the effectiveness of marketing promotions. Market share is defined as the company’s proportion of the total number of products sold in a category. If a p
The manufacturer of Boston and Vermont asphalt shingles constructed control charts and analyzed several quality characteristics. One characteristic of interest is the strength of the sealant on the shingle. During each day of production, three shingles are tested for their sealant strength. (Thus,
A hospital administrator has the business objective of reducing the time to process patients’ medical records after discharge. She determined that all records should be processed within 5 days of discharge. Thus, any record not processed within 5 days of a is nonconforming. The administrator
A professional basketball player has embarked on a program to study his ability to shoot foul shots. On each day in which a game is not scheduled, he intends to shoot 100 foul shots. He maintains records over a period of 40 days of practice, with the results stored in Foulspc:a. Construct a p chart
The funds transfer department of a bank is concerned with turnaround time for investigations of funds transfer payments. A payment may involve the bank as a remitter of funds, a beneficiary of funds, or an intermediary in the payment. An investigation is initiated by a payment inquiry or a query by
A branch manager of a brokerage company is concerned with the number of undesirable trades made by her sales staff. A trade is considered undesirable if there is an error on the trade ticket. Trades with errors are canceled and resubmitted. The cost of correcting errors is billed to the brokerage
As chief operating officer of a local community hospital, you have just returned from a three day seminar on quality and productivity. It is your intention to implement many of the ideas that you learned at the seminar. You have decided to construct control charts for the upcoming month for the
A team working at a cat food company had the business objective of reducing nonconformance in the cat food canning process. As the team members began to investigate the current process, they found that, in some instances, production needed expensive overtime costs to meet the requirements requested
Refer to Problem 14.54. The production team at the cat food company investigating nonconformities due to the fill weight of the cans determined that at 15 minute intervals during each shift, a subgroup of five cans would be selected, and the contents of the selected cans would be weighed. The
The bottling division of Sweet Suzy’s Sugarless Cola maintains daily records of the occurrences of unacceptable cans flowing from the filling and sealing machine. The data in Colaspc lists the number of cans filled and the number of nonconforming cans for one month (based on a five day
The manager of the accounting office of a large hospital has the business objective of reducing the number of incorrect numbers entered into the computer system. A subgroup of 200 account numbers is selected from each day’s output, and each account number is inspected to determine whether it is a
A regional manager of a telecommunications company is responsible for processing requests concerning additions, changes, and deletions of service. She forms a service improvement team to look at the corrections to the orders in terms of central office equipment and facilities required to process
1. What type of data source would the company’s own historical data be? Identify other possible data sources that the research team might use to examine the current marketplace for residential broadband services in a city such as Ashland.2. What type of data collection techniques might the team
Reviewing the marketing department team concluded that a segment of Ashland households might be interested in a discounted trial subscription to the AMS 3- For- All cable/ phone/ Internet service.1. No discount for the 3-For- All cable/ phone/ Internet service. Subscribers would pay $ 24.99 per
To ensure that as many trial subscriptions to the 3- For- All service as possible are converted to regular subscriptions, the marketing department works closely with the customer support department to accomplish a smooth initial process for the trial subscription customers. To assist in this
In its continuing study of the 3- For- All subscription solicitation process, a marketing department team wants to test the effects of two types of structured sales presentations ( personal formal and personal informal) and the number of hours spent on telemarketing on the number of new
The AMS technical services team has embarked on a quality improvement effort. Its first project relates to maintaining the target upload speed for its Internet service subscribers. Upload speeds are measured on a device that records the results on a standard scale in which the target value is
Recently, Ashland MultiComm Services has been criticized for its inadequate customer service in responding to questions and problems about its telephone, cable television, and Internet services. Senior management has established a task force charged with the business objective of improving customer
1. For the variable you identify, compute the appropriate numerical descriptive measures and construct a boxplot.2. For the variable you identify, construct a graphical display. What conclusions can you reach from this other plot that cannot be made from the boxplot?3. Summarize your findings in a
1. If a sample of 50 prospective customers is selected and no free premium channels are included in the 3- For- All service offer, given past results, what is the probability that a. fewer than 3 customers will subscribe to the 3- For- All service offer? b. 0 customers or 1 customer will subscribe
1. Assuming that the distribution has not changed from what it was in the past year, what is the probability that the upload speed isa. Less than 1.0?b. Between 0.95 and 1.0?c. Between 1.0 and 1.05?d. Less than 0.95 or greater than 1.05?2. The objective of the operations team is to reduce the
1. Each day, at 25 random times, the upload speed is measured. Assuming that the distribution has not changed from what it was in the past year, what is the probability that the mean upload speed is a. less than 1.0? b. betweena. Less than 1.0?b. Between 0.95 and 1.0?c. Between 1.0 and
The marketing department has been considering ways to increase the number of new subscriptions to the 3- For-All cable/ phone/ Internet service.1. Does your household subscribe to telephone service from Ashland?(1) Yes(2) No2. Does your household subscribe to Internet service from Ashland?(1)
Continuing its monitoring of the upload speed first de-scribed in the Chapter 6 Managing Ashland MultiComm Services case on page 221, the technical operations department wants to ensure that the mean target upload speed for all Internet service subscribers is at least 0.97 on a standard scale in
AMS communicates with customers who sub-scribe to cable television services through a special se-cured email system that sends messages about service changes, new features, and billing information to in-home digital set- top boxes for later display.1. Analyze the data in Table AMS10.1 and write a
1. The student news service at Clear Mountain State University (CMSU) has decided to gather data about the undergraduate students that attend CMSU. They create and distribute a survey of 14 questions and receive responses from 62 undergraduates (stored in Undergrad Survey). For each question asked
1. The Student News Service at Clear Mountain State University (CMSU) has decided to gather data about the undergraduate students who attend CMSU. They create and distribute a survey of 14 questions and receive responses from 62 undergraduates ( stored in UndergradSurvey). Download (see Appendix C)
1. The student news service at Clear Mountain State University (CMSU) has decided to gather data about the undergraduate students who attend CMSU. They create and distribute a survey of 14 questions and receive responses from 62 undergraduates (stored in UndergradSurvey ). For each numerical
The dean of students at CMSU has learned about the undergraduate survey and has decided to undertake a similar survey for graduate students at CMSU. She creates and distributes a survey of 14 questions and re-ceives responses from 44 graduate students (stored in GradSurvey). For each numerical
1. The Student News Service at Clear Mountain State University (CMSU) has decided to gather data about the undergraduate students who attend CMSU. They create and distribute a survey of 14 questions and receive responses from 62 undergraduates (stored in UndergradSurvey ). For each numerical
1. The dean of students at CMSU has learned about the undergraduate survey and has decided to undertake a similar survey for graduate students at CMSU. She creates and distributes a survey of 14 questions and receives responses from 44 graduate students (stored in GradSurvey). For each numerical
The Student News Service at Clear Mountain State University ( CMSU) has decided to gather data about the undergraduate students that attend CMSU. It creates and distributes a survey of 14 questions and receives responses from 62 undergraduates ( stored in UndergradSurvey ). a. At the 0.05 level
1. a. Is there evidence of a difference between males and females in age, undergraduate grade point average, graduate grade point average, expected salary upon graduation, spending on textbooks and supplies, text messages sent in a week, and the wealth needed to feel rich? b. Is there evidence
The team decides to use both business transactional data and the results of a personal profile survey that every purchaser completes as their sources of data. 1. Which variables in the survey are categorical? 2. Which variables in the survey are numerical? 3. Which variables are discrete
The market research team at AdRight is assigned the task to identify the profile of the typical customer for each tread-mill product offered by CardioGood Fitness. 1. Create a customer profile for each CardioGood Fitness treadmill product line by developing appropriate tables and charts. 2. Write
1. Create a customer profile for each CardioGood Fitness treadmill product line by developing appropriate tables and charts. 2. Write a report to be presented to the management of Car-dioGood Fitness detailing your findings.
1. For each CardioGood Fitness treadmill product line (see the CardioGoodFitness file), construct two- way contingency tables of gender, education in years, relationship status, and self- rated fitness. (There will be a total of six tables for each treadmill product.)2. For each table you
1. For each CardioGood Fitness treadmill product line, determine whether the age, income, usage, and the 2. Write a report to be presented to the management of CardioGood Fitness, detailing your findings.
1. Construct 95% confidence interval estimates to create a customer profile for each CardioGood Fitness treadmill product line. 2. Write a report to be presented to the management of CardioGood Fitness detailing your findings.
1. Determine whether differences exist between males and females in their age in years, education in years, an-nual household income ($), mean number of times the customer plans to use the treadmill each week, and mean number of miles the customer expects to walk or run each week.2. Determine
1. Determinewhether differences exist in the relationship status and the self rated fitness based on the product purchased ( TM195, TM498, TM798). 2. Write a report to be presented to the management of CardioGood Fitness, detailing your findings.
Follow up the Using Statistics Revisited section on page 71 by analyzing the differences in 3- year return per-centages, 5- year return percentages, and 10- year return per-centages for the sample of 316 retirement funds stored in Retirement Funds . In your analysis, examine differences be-tween
Follow up the Using Statistics Revisited section on page 130 by computing descriptive statistics to analyze the differences in 3- year return percentages, 5- year return percentages, and 10- year return percentages for the sample of 316 retirement funds stored in Retirement Funds . In your
1. Follow up the “ Using Statistics: The Choice Is Yours, Revisited” on page 71 by constructing contingency tables of market cap and type, market cap and risk, market cap and rating, type and risk, type and rating, and risk and rating for the sample of 316 retirement funds stored in2. For
Follow up the More Descriptive Choices Revisited Using Statistics scenario on page 136 by constructing normal probability plots for the 3- year return percentages, 5- year return percentages, and 10- year return percentages for the sample of 316 retirement funds stored in Retirement Funds. In your
Follow up the More Descriptive Choices, Revisited Using Statistics scenario on page 136 by constructing 95% confidence intervals estimates of the three- year return percentages, five- year return percentages, and ten- year return percentages for the sample of growth and value funds and for the
1. Determine whether there is a difference in the 3- year return percentage, 5- year return percentages, and 10- year return percentages of the growth and value funds (stored in Retirement Funds.2. Determine whether there is a difference between the small, mid- cap, and large market cap funds
You work in the corporate office for a nationwide convenience store franchise that operates nearly 10,000 stores. The per- store daily customer count has been steady, at 900, for some time (.e., the mean number of customers in a store in one day is 900).1. Construct 95% confidence interval
You work in the corporate office for a nationwide convenience store franchise that operates nearly 10,000 stores. The per- store daily customer count (i.e., the mean number of customers in a store in one day) has been steady, at 900, for some time. This increase seems like a substantial amount to
You continue to work in the corporate office for a nationwide convenience store franchise that operates nearly 10,000 stores. The per- store daily customer count (i.e., the mean number of customers in a store in one day) has been steady, at 900, for some time. To increase the customer count, the
Jessica believes that the number of cups of coffee that she sells daily at her coffee shop depends primarily on the temperature outside. The five days of data that she’s collected are shown in the table below:a. Show the data in a scatter diagram and use the least squares criterion to find the
It has been argued that a shopper can have too many choices when considering a major purchase, leading to increased shopping anxiety. (See, for example, The Paradox of Choice Why More Is Less by Barry Schwartz.) In a study of shopping behavior, simple linear regression was used to link the number
Refer to Exercise 1 (Jessica’s coffee shop), where the least squares line is ŷ = 660 6.8x. a. Report the SSE and s y. x values. b. Tell what these measures represent.
Refer to Exercise 2 (R & D budget), where the least squares line is ŷ = 3.5 1.0x. a. Report the SSE and s y. x values. b. Tell what these measures represent.
Refer to Exercise 3 (interest rate and home sales), where the least squares line is ŷ = 90 4x. a. Report the SSE and s y. x values. b. Tell what these measures represent.
Refer to Exercise 4 (employee turnover rate), where the least squares line is ŷ = 139.2 6.7x. a. Report the SSE and s y. x values. b. Tell what these measures represent.
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