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Questions and Answers of Statistics

Compute Laspeyresâ€™ price index for 2013 using 2000 as the baseperiod.
Compute Paascheâ€™s index for 2013 using 2000 as the baseperiod.
Determine a value index for 2013 using 2000 as the baseperiod.
Compute a simple price index for each of the three items. Use 2000 as the baseperiod.
Compute Laspeyresâ€™ price index for 2013 using 2000 as the baseperiod.
Compute Paascheâ€™s index for 2013 using 2000 as the baseperiod.
Determine a value index for 2013 using 2000 as the baseperiod.
Compute a simple price index for each of the four items. Use 2000 as the baseperiod.
Compute Laspeyresâ€™ price index for 2013 using 2000 as the baseperiod.
Compute Paascheâ€™s index for 2013 using 2000 as the baseperiod.
Determine a value index for 2013 using 2000 as the baseperiod.
Compute a simple price index for each of the four items. Use 1990 as the baseperiod.
Compute Laspeyresâ€™ price index for 2013 using 1990 as the baseperiod.
Compute Paascheâ€™s index for 2013 using 1990 as the baseperiod.
Determine a value index for 2013 using 1990 as the baseperiod.
A special-purpose index is to be designed to monitor the overall economy of the Southwest. Four key series were selected. After considerable deliberation, it was decided to weight retail sales 20%,
We are making a historical study of the American economy from 1950 to 1980. Data on prices, the labor force, productivity, and the GNP were collected. Note in the following table that the CPI has a
The management of Ingalls Super Discount stores, with several stores in the Oklahoma City area, wants to construct an index of economic activity for the metropolitan area. Management contends that,
Calculate a four-quarter weighted moving average for the number of shares outstanding for the Boxley Box Company for the nine quarters of data. The data are reported in thousands. Apply weights of
Listed below is the number of movie tickets sold at the Library Cinema-Complex, in thousands, for the period from 2001 to 2013. Compute a five-year weighted moving average using weights of .1, .1,
Listed below is the number of rooms rented at Plantation Resorts of Georgia for the years from 2003 to 2013.Determine the least squares equation. According to this information, what is the estimated
On the following page is the net sales in $ million for Home Depot Inc. and its subsidiaries from 1993 to 2012.Determine the least squares equation. On the basis of this information, what are the
The sales by Walkerâ€™s Milk and Dairy Products in millions of dollars for the period from 2007 to 2013 are reported in the following table.Determine the least squares regression trend equation.
Sally’s Software Inc. is a rapidly growing supplier of computer software to the Sarasota area. Sales for the last 5 years, 2009 to 2013, are given below.SalesYear ($ millions)2009 .........1.12010
Victor Anderson, the owner of Anderson Belts Inc., is studying absenteeism among his employees. His workforce is small, consisting of only five employees. For the last 3 years, 2011 through 2013, he
Appliance Center sells a variety of electronic equipment and home appliances. For the last 4 years, 2010 through 2013, the following quarterly sales (in $ millions) were reported.Determine a typical
The planning department of Padget and Kure Shoes, the manufacturer of an exclusive brand of women€™s shoes, developed the following trend equation, in millions of pairs, based on 5 years of
Refer to Exercise 9 regarding the absences at Anderson Belts, Inc. Use the seasonal indexes you computed to determine the deseasonalized absences. Determine the linear trend equation based on the
Refer to Exercise 10, regarding sales at Appliance Center. Use the seasonal indexes you computed to determine the deseasonalized sales. Determine the linear trend equation based on the quarterly data
Recall Exercise 9 from Chapter 14 and the regression equation to predict job performance.a. Plot the residuals in the order in which the data are presented.b. Test for autocorrelation at the .05
Consider the data in Exercise 10 from Chapter 14 and the regression equation to predict commissions earned. a. Plot the residuals in the order in which the data are presented.b. Test for
The asset turnovers, excluding cash and short-term investments, for RNC Company from 2004 to 2014 are:a. Plot the data.b. Determine the least squares trend equation.c. Calculate the points on the
The sales, in billions of dollars, of Keller Overhead Door Inc. for 2009 to 2014 are:a. Plot the data.b. Determine the least squares trend equation.c. Use the trend equation to calculate the points
The number of employees, in thousands, of Keller Overhead Door Inc. for the years 2009 to 2014 are:a. Plot the data.b. Determine the least squares trend equation.c. Use the trend equation to
Listed below is the selling price for a share of PepsiCo Inc. at the close of each year from 1990 to 2012..:.a. Plot the data.b. Determine the least squares trend equation.c. Calculate the points
If plotted, the following sales series would appear curvilinear. This indicates that sales are increasing at a somewhat constant annual rate (percent). To fit the sales, therefore, a logarithmic
Listed below is the selling price for a share of Oracle Inc. stock at the close of the year for 1990 through 2012.a. Plot the data.b. Determine the least squares trend equation. Use both the actual
The production of Reliable Manufacturing Company for 2012 and part of 2013 follows.a. Using the ratio-to-moving-average method, determine the specific seasonals for July, August, and September
The sales of Andre€™s Boutique for 2012 and part of 2013 are:a. Using the ratio-to-moving-average method, determine the specific seasonals for July, August, September, and October 2012.b.
The quarterly production of pine lumber, in millions of board feet, by Northwest Lumber for 2010 through 2014 is:a. Determine the typical seasonal pattern for the production data using the
Work Gloves Corp. is reviewing its quarterly sales of Toughie, the most durable glove it produces. The numbers of pairs produced (in thousands) by quarter for 2009 through 2014 are:a. Using the
Sales of roof material, by quarter, for 2007 through 2013, by Carolina Home Construction Inc. are shown below (in $000).a. Determine the typical seasonal patterns for sales using the
Blueberry Farms Golf and Fish Club of Hilton Head, South Carolina, wants to find monthly seasonal indexes for package play, nonpackage play, and total play. The package play refers to golfers who
The following is the number of retirees receiving benefits from the State Teachers Retirement System of Ohio from 1991 until 2012.a. Plot the data.b. Determine the least squares trend equation. Use a
Ray Anderson, owner of Anderson Ski Lodge in upstate New York, is interested in forecasting the number of visitors for the upcoming year. The following data are available, by quarter, from the first
The enrollment in the College of Business at Midwestern University by quarter from 2009 to spring 2013 is:Using the ratio-to-moving-average method:a. Determine the four quarterly indexes.b. Interpret
On page 641 at the beginning of this chapter, we presented a graph showing the price per gallon of gasoline from 1990 until 2012. The actual data for each year are given below.Determine the trend
Develop a trend equation for the net sales ($ million) for Home Depot. Consider both a linear trend and a nonlinear trend. Which one would you select and why? Given the trend equation you selected,
Consider the variable mean amount per transaction in the Home Depot data presented above. This variable indicates, for example, that the average customer spent $39.13 on goods during a store visit in
Use the variables mean amount per transaction and number of associates to forecast net sales. Are these two independent variables reasonable predictors of net sales?Because all of these variables are
Refer to the Baseball 2012 data, which include information on the 2012 Major League Baseball season. The data include the mean player salary since 1989. Plot the information and develop a linear
It appears that the imports of carbon black have been increasing by about 10% annually.a. Determine the logarithmic trend equation.b. By what percent did imports increase, on the average, during the
Refer to the following diagram.a. Estimate the linear trend equation for the production series by drawing a straight line through the data.b. What is the average annual decrease in production?c.
Refer to the following diagram.a. Estimate the linear trend equation for the personal income series.b. What is the average annual increase in personalincome?
Reported below are the amounts spent on advertising ($ millions) by a large firm from 2004 to 2014.a. Determine the logarithmic trend equation.b. Estimate the advertising expenses for 2017.c. By what
Listed below are the net sales (in millions of euros) for the Adidas Group from 2008 to 2012.Year Net Sales2008 ........ 10,7992009 ........ 10,3812010 ........ 11,9902011 ........ 13,3322012
The table below shows the unemployment rate and the available workforce for three counties in northwest Pennsylvania for May 2010 and April 2013.a. In May 2010, the national unemployment rate was
Tom Sharkey is the owner of Sharkey Chevy, Buick, GMC. At the start of the year, Tom instituted a customer opinion program to find ways to improve service. The day after the service is performed,
Refer to Exercise 7.a. On the basis of this initial experience, determine the control limits for the range. Plot the experience on a chart.b. Does there seem to be a time when there is too much
Below is a p-chart for a manufacturing process.a. What is the mean proportion defective? What are the upper and lower control limits?b. Are there any sample observations that indicate the process is
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
A bicycle manufacturer randomly selects 10 frames each day and tests for defects. The numbers of defective frames found over the last 14 days are 3, 2, 1, 3, 2, 2, 8, 2, 0, 3, 5, 2, 0, and 4.
During the process of producing toilet paper, Scott Paper randomly selects a toilet paper roll 5 times throughout the day and subjects each roll to a stress test to see how often the paper tears.
Sam’s Supermarkets tests its checkout clerks by randomly examining the printout receipts for scanning errors. The following numbers are the number of errors on each receipt for October 27: 0, 1, 1,
Dave Christi runs a car wash chain with outlets scattered throughout Chicago. He is concerned that some local managers are giving away free washes to their friends. He decides to collect data on the
At Rumsey’s Old Fashion Roast Beef, cola drinks are filled by an automatic machine whose operation is based on the weight of the drink. When the process is in control, the machine fills each cup so
Charter National Bank has a staff of loan officers located in its branch offices throughout the Southwest. Robert Kerns, vice president of consumer lending, would like some information on the typical
Early Morning Delivery Service guarantees delivery of small packages by 10:30 a.m. Of course, some of the packages are not delivered by 10:30 a.m. For a sample of 200 packages delivered each of the
Steele Breakfast Foods Inc. produces a popular brand of raisin bran cereal. The package indicates it contains 25.0 ounces of cereal. To ensure the product quality, the Steele inspection department
An investor believes there is a 50€“50 chance that a stock will increase on a particular day. To investigate this idea, for 30 consecutive trading days the investor selects a random sample
Lahey Motors specializes in selling cars to buyers with a poor credit history. Listed below is the number of cars that were repossessed from Lahey customers because they did not meet the payment
Out of 110 diesel engines tested, a rework and repair facility found 9 had leaky water pumps, 15 had faulty cylinders, 4 had ignition problems, 52 had oil leaks, and 30 had cracked blocks. Draw a
Samples of size n = 4 are selected from a production line.a. What is the value of the A2 factor used to determine the upper and lower control limits for the mean?b. What are the values of the D3 and
A new industrial oven has just been installed at Piatt Bakery. To develop experience regarding the oven temperature, an inspector reads the temperature at four different places inside the oven each
Determine the probability of accepting lots that are 10%, 20%, 30%, and 40% defective using a sample of size 12 and an acceptance number of 2.
Determine the probability of accepting lots that are 10%, 20%, 30%, and 40% defective using a sample of size 14 and an acceptance number of 3.
Warren Electric manufactures fuses for many customers. To ensure the quality of the out-going product, it tests 10 fuses each hour. If no more than one fuse is defective, it packages the fuses and
Grills Video Products purchases LCDs from Mira Electronics. According to his sampling plan, Art Grills, owner of Grills Video, will accept a shipment of LCDs if 3 or fewer are defective in a sample
The production supervisor at Westburg Electric Inc. noted an increase in the number of electric motors rejected at the time of final inspection. Of the last 200 motors rejected, 80 of the defects
The manufacturer of running shoes conducted a study on its newly developed jogging shoe. Listed below are the type and frequency of the nonconformities and failures found.Develop a Pareto chart to
A new machine has just been installed to cut and rough-shape large slugs. The slugs are then transferred to a precision grinder. One of the critical measurements is the outside diameter. The quality
Long Last Tire Company, as part of its inspection process, tests its tires for tread wear under simulated road conditions. Twenty samples of three tires each were selected from different shifts over
The producer of a candy bar, called the €œKing James€ Bar, reports on the package that the calorie content is 420 per 2-ounce bar. A sample of five bars from each of the last 10
An automatic machine produces 5.0-millimeter bolts at a high rate of speed. A quality control program has been initiated to control the number of defectives. The quality control inspector selects 50
A process engineer is considering two sampling plans. In the first, a sample of 10 will be selected and the lot accepted if 3 or fewer are found defective. In the second, the sample size is 20 and
Christina Sanders is a member of the womenâ€™s basketball team at Windy City College. Last season, she made 55% of her free throw attempts. In an effort to improve this statistic, she attended a
Eric’s Cookie House sells chocolate chip cookies in shopping malls. Of concern is the number of chocolate chips in each cookie. Eric, the owner and president, would like to establish a control
The numbers of “near misses” recorded for the last 20 months at Lima International Airport are 3, 2, 3, 2, 2, 3, 5, 1, 2, 2, 4, 4, 2, 6, 3, 5, 2, 5, 1, and 3. Develop an appropriate control
The following numbers of robberies were reported during the last 10 days to the robbery division of the Metro City Police: 10, 8, 8, 7, 8, 5, 8, 5, 4, and 7. Develop an appropriate control chart.
Swiss Watches, Ltd. purchases watch stems for their watches in lots of 10,000. Their sampling plan calls for checking 20 stems, and if 3 or fewer stems are defective, the lot is accepted.a. Based on
Automatic Screen Door Manufacturing Company purchases door latches from a number of vendors. The purchasing department is responsible for inspecting the incoming latches. Automatic purchases 10,000
At the beginning of each football season, Team Sports, the local sporting goods store, purchases 5,000 footballs. A sample of 25 balls is selected, and they are inflated, tested, and then deflated.
Some people are in favor of reducing federal taxes to increase consumer spending and others are against it. Two persons are selected and their opinions are recorded. Assuming no one is undecided,
A quality control inspector selects a part to be tested. The part is then declared acceptable, repairable, or scrapped. Then another part is tested. List the possible outcomes of this experiment
A firm will promote two employees out of a group of six men and three women.a. List all possible outcomes. b. What probability concept would be used to assign probabilities to the outcomes?
A sample of 40 oil industry executives was selected to test a questionnaire. One question about environmental issues required a yes or no answer.a. What is the experiment?b. List one possible
A student is taking two courses, history and math. The probability the student will pass the history course is .60, and the probability of passing the math course is .70. The probability of passing
The aquarium at Sea Critters Depot contains 140 fish. Eighty of these fish are green sword- tails (44 female and 36 male) and 60 are orange swordtails (36 female and 24 males.). A fish is randomly
Refer to the following table.a. Determine P(A1).b. Determine P(B1 Æ’ A2).c. Determine P(B2 andA3).
Three defective electric toothbrushes were accidentally shipped to a drugstore by Clean brush Products along with 17 non-defective ones.a. What is the probability the first two electric toothbrushes

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