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mathematics
statistics

Questions and Answers of Statistics

Refer to the results in Problem 16.16 on page 682 and Problem 16.31 on page 692 concerning the yearly amount of solar power installed (in megawatts) in the United States from 2000 through 2008
The following data (stored in Movie) represent the yearly movie attendance (in billions) from 2001 to 2009:Year
In forecasting a monthly time series over a five-year period from January 2006 to December 2010, the exponential trend forecasting equation for January isTake the antilog of the appropriate
In forecasting daily time-series data, how many dummy variables are needed to account for the seasonal component day of the week?
In forecasting a quarterly time series over the five-year period from the first quarter of 2006 through the fourth quarter of 2010, the exponential trend forecasting equation is given bywhere quarter
Refer to the exponential model given in Problem 16.42. a. What is the fitted value of the series in the fourth quarter of 2008? b. What is the fitted value of the series in the first quarter of
The data in Toys R Us are quarterly revenues (in millions of dollars) for Toys R Us from 1996 through 2008.a. Do you think that the revenues for Toys R Us are subject to seasonal variation?
Are gasoline prices higher during the height of the summer vacation season than at other times? The data in GasPrice give the mean monthly prices (in dollars per gallon) for unleaded gasoline in the
The data in Travel show the average traffic on Google recorded at the beginning of each month from January 2004 to August 2010 for searches from the United States concerning travel (scaled to the
The following data (stored in Credit) are monthly credit card charges (in millions of dollars) for a popular credit card issued by a large bank (the name of which is not disclosed, at its request):a.
The data in Silver-Q represent the price in London for an ounce of silver (in U.S. $) at the end of each quarter from 2004 through 2009.a. Plot the data.b. Develop an exponential trend forecasting
The data in Gold represent the price in London for an ounce of gold (in U.S. $) at the end of each quarter from 2004 through 2009. a. Plot the data. b. Develop an exponential trend forecasting
The following data, stored in NASCAR, provide the number of accidents in the NASCAR Sprint Cup series from 2001 to 2009:Year
What are the different components of a time-series model?
What is the difference between moving averages and exponential smoothing?
What is the major difference between using Syx and MAD for evaluating how well a particular model fits the data?
The following table (stored in Polio) represents the annual incidence rates (per 100,000 persons) of reported acute poliomyelitis recorded over five-year periods from 1915 to 1955:a. Plot the
How have stocks performed in the past? The following table presents the data stored in Stock Performance, which show the performance of a broad measure of stock performance (by percentage) for each
The U.S. Department of Labor gathers and publishes statistics concerning the labor market. The file WorkForce contains data on the size of the U.S. civilian noninstitutional population of people 16
The monthly wellhead and residential prices for natural gas (dollars per thousand cubic feet) in the United States from 2008 through 2009 are stored in Natural Gas. For the wellhead price and the
The data in the following table (stored in McDonalds) represent the gross revenues (in billions of current dollars) of McDonald's Corporation from 1975 through 2009:a. Plot the data.b. Compute the
Teachers' Retirement System of the City of New York offers several types of investments for its members. Among the choices are investments with fixed and variable rates of return. There are several
As a consultant to an investment company trading in various currencies, you have been assigned the task of studying long-term trends in the exchange rates of the Canadian dollar, the Japanese yen,
The following data (stored in EuroDollar) represent the sixth-month Eurodollar deposit rate from 2001 to 2009:Year EuroDollar
The file Audits contains the number of audits of corporations with assets of more than $250 million conducted by the Internal Revenue Service. (Data extracted from K. McCoy, "IRS Audits Big Firms
If you are using the method of least squares for fitting trends in an annual time series containing 25 consecutive yearly values,1. what coded value do you assign to X for the first year in the
The following data were collected on nonconfor-mances 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
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
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
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
The branch manager of a savings bank has recorded the number of errors 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
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 PtFalls represent the number of patient falls per
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
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
For subgroups of n = 4, what is the value ofa. 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 ofa. 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
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
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
The manager 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
The manager of a warehouse for a telephone 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
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
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
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
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
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
For an in-control process with subgroup data n = 4, = 20, and = 2, find the estimate ofa. The population mean of all 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
For an in-control process with subgroup data n = 3, = 100, and = 3.386, compute the percentage of outcomes within specifications ifa. LSL = 98 and USL = 102.b. LSL = 93 and USL = 107.5.c. LSL =
For an in-control process with subgroup data n = 3, = 100, and = 3.386, compute the Cp, CPL, CPU, and Cpk if a. LSL = 98 and USL = 102. b. LSL = 93 and USL = 107.5.
Referring to the data of Problem 17.24 on page 736, stored in SpWater, the researchers stated, "Some of the benefits of a capable process are increased customer satisfaction, increased operating
Refer to the data in Problem 17.25 on page 737 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
Refer to Problem 17.27 on page 737 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
Refer to Problem 17.22 on page 736 concerning waiting time for customers at a bank (data stored in BankTime). Suppose management has set a USL of five minutes on waiting time and specified that at
What is the difference between common cause variation and special cause variation? Discuss.
Under what circumstances do you use a p chart? Discuss.
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
What is the difference between attribute control charts and variables control charts?
Why are and R charts used together?
What principles did you learn from the red bead experiment? Discuss.
What is the difference between process potential and process performance? Discuss.
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?
Why is a capability analysis not performed on out-of-control processes?
According to the American Society for Quality, customers in the United States consistently rate service quality lower than product quality (American Society for Quality, The Quarterly Quality Report,
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
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
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
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
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
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,
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
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
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
Refer to Problem 17.54. 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
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
The manager of the accounting office of a large hospital has the business objective of reducing the number of incorrect account numbers entered into the computer system. A subgroup of 200 account
A regional manager of a telephone company is responsible for processing requests concerning additions, changes, and deletions of telephone service. She forms a service improvement team to look at the
In many manufacturing processes, the term work-inprocess (often abbreviated WIP) is used. At the BLK Publishing book manufacturing plants, WIP represents the time it takes for sheets from a press to
The data in represent different characteristics of used automobiles advertised for sale in a recent year. The variables included are car, model, year of model (2000 = 0), asking price (in $000),
The data in Credit Unions consist of different characteristics of 7,903 credit unions in the United States. The variables included are name, city, state, zip code, region, total assets ($), total
The data in consist of the different characteristics of 382 banks in the Tri-State New York City area as of June 30, 2008. The variables included are name, state, zip code, number of domestic and
A mining company operates a large heap-leach gold mine in the western United States. The gold mined at this location consists of ore that is very low grade, having about 0.0032 ounce of gold in 1 ton
Many factors determine the attendance at Major League Baseball games. These factors can include when the game is played, the weather, the opponent, whether the team is having a good season, and
Repeat Problem 18.2 for the Philadelphia Phillies.In problemMany factors determine the attendance at Major League Baseball games. These factors can include when the game is played, the weather, the
Repeat Problem 18.2 for the Chicago Cubs.In problemMany factors determine the attendance at Major League Baseball games. These factors can include when the game is played, the weather, the opponent,
Repeat Problem 18.2 for the Cincinnati Reds.In problemMany factors determine the attendance at Major League Baseball games. These factors can include when the game is played, the weather, the
The file Homes contains information on all the single-family houses sold in a small city in the Midwestern United States for one year. The following variables are included:Price-Selling price of
Zagat's publishes restaurant ratings for various locations in the United States. The file Restaurants2 contains the Zagat rating for food, decor, service, and price per person for a sample of 50
The data in Auto2008 represent different characteristics of 171 late-model automobiles. The variables included are make/model, length (in.), width (in.), height (in.), wheelbase (in.), weight (lbs.),
Consider the following research proposal:Early initiation of sexual activity is a risk factor for teenage pregnancy and sexually transmitted disease, and is also highly correlated with drug use,
1. Why would an experiment not be appropriate to investigate the relationship between ethnicity and health? What would be an appropriate research design?2. The president of a university wants to
The following was taken directly from Schuetze (2004):"Increased student confidence in their ability to avoid plagiarism would hypothetically result in an inaccurate perception that they are fully
Read excerpts from the following three articles about the use of technology to enhance classroom interaction and learning. As you read each excerpt, consider these questions:1. Which sources are
Put the following information into an APA-style reference: • Article title: Costly Cell Phones: The Impact of Cell Phone Rings on Academic Performance • Journal title: Teaching of Psychology •
Read the following examples and determine whether they are related to external validity, internal validity, or reliability at the study level. Cobb, Heaney, Corcoran, and Henderson-Begg (2010) found
Assume that you want to examine plagiarism among college students. Can you identify the four scales of measurement among the items below? 1. I believe plagiarism is a serious problem among college
Review the following excerpts from journal articles. As you do so, consider the following questions: • What is the purpose of the described scale? • What do I learn about the development and
Suppose you observed 10 people at dinner and recorded what type of beverage they drank: Participant 1: Pepsi Participant 6: Water Participant 2: Orange juice Participant 7: Water Participant 3:
Suppose you coded your 10 participants from Practice 5.1 as such:Participant 1: Pepsi (sugary drink) Participant 6: Water (water)Participant 2: Orange juice (juice) Participant 7: Water
1. If 5 participants were observed drinking sugary drinks, 3 water, and 2 juice, what is the modal type of drink?2. What is the median of the following distribution (N = 48):3. What is the mean of

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