Question: A statewide real estate sales agency, Farm

> 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 number of “voided” sales receipts. Of cou

> 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. Over a 3-day period, the testing of 15 rolls found the f

> 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 50 moves is selected for each of the l

> 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 period? c. Estimate imports for the year

> The sales by Walker’s Milk and Dairy Products in millions of dollars for the period from 2011 to 2017 are reported in the following table. Determine the least squares regression trend equation. Estimate the sales for 2019.  

> Listed below are the net sales in $ million for Home Depot Inc. and its subsidiaries from 1993 to 2015. Remember to code the years starting at 1 for year 1993. Determine the least squares equation. On the basis of this information, what are th

> 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 last 15 working days, the following numbers of package

> Reported below are the amounts spent on advertising ($ millions) by a large firm from 2007 to 2017. a. Determine the logarithmic trend equation. b. Estimate the advertising expenses for 2020. c. By what percent per year did advertising expen

> Listed below is the number of movie tickets sold at the Library Cinema-Complex, in thousands, for the period from 2004 to 2016. Compute a five-year weighted moving average using weights of .1, .1, .2, .3, and .3, respectively. Describe the trend in yie

> 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 for the 4 years. Forecast the seasonally adjusted sa

> Team Sports Inc. sells sporting goods to high schools and colleges via a nationally distributed catalog. Management at Team Sports estimates it will sell 2,000 Wilson Model A2000 catcher’s mitts next year. The deseasonalized sales are projected t

> Appliance Center sells a variety of electronic equipment and home appliances. For the last 4 years, 2013 through 2016, the following quarterly sales (in$ millions) were reported. Determine a typical seasonal index for each of the four quarters

> Following are the quantities and prices for the years 2000 and 2017 for Kinzua Valley Geriatrics. Use 2000 as the base period. a. Determine the simple price indexes. b. Determine the simple aggregate price index for the two years. c. Determi

> Fruit prices and the amounts consumed for 2000 and 2017 are below. Use 2000 as the base. a. Determine the simple price indexes. b. Determine the simple aggregate price index for the two years. c. Determine Laspeyres price index. d. Determin

> Determine a value index for 2016 using 1990 as the base period. Use the following price information for selected items for 1990 and 2016. Production figures for those two periods are also given.  

> Compute a simple aggregate price index. Use 1990 as the base period. Use the following price information for selected items for 1990 and 2016. Production figures for those two periods are also given.  

> A sample of employees at a large chemical plant was asked to indicate a preference for one of three pension plans. The results are given in the following table. Does it seem that there is a relationship between the pension plan selected and the job cla

> Far West University offers both day and evening classes in business administration. A survey of students inquires how they perceive the prestige associated with eight careers. A day student was asked to rank the careers from 1 to 8, with 1 having the m

> Determine a value index for 2016 using 2000 as the base period. Use the following price information for selected foods for 2000 and 2016 given in the following table.  

> A study regarding the relationship between age and the amount of pressure sales personnel feel in relation to their jobs revealed the following sample information. At the .01 significance level, is there a relationship between job pressure and age?

> Compute Paasche’s index for 2016 using 2000 as the base period. Use the following price information for selected foods for 2000 and 2016 given in the following table.  

> Compute a simple aggregate price index. Use 2000 as the base period. Use the following price information for selected foods for 2000 and 2016 given in the following table.  

> Determine a value index for 2016 using 2000 as the base period. Use the following information. Betts Electronics purchases three replacement parts for robotic machines used in its manufacturing process. Information on the price of the replacement part

> The following table gives information on the Consumer Price Index (Base = 1982–84) and the monthly take-home pay of Bill Martin, an employee at Ford Motor Corporation. a. What is the purchasing power of the dollar in 2016, based on the p

> Compute Paasche’s index for 2016 using 2000 as the base period. Use the following information. Betts Electronics purchases three replacement parts for robotic machines used in its manufacturing process. Information on the price of the replacemen

> Compute a simple aggregate price index for 2016. Use 2000 as the base period. Use the following information. Betts Electronics purchases three replacement parts for robotic machines used in its manufacturing process. Information on the price of the re

> Determine a value index for 2016 using 2000 as the base period. Use the following information on food items for the years 2000 and 2016.  

> An insurance company, based on past experience, estimates the mean damage for a natural disaster in its area is $5,000. After introducing several plans to prevent loss, it randomly samples 200 policyholders and finds the mean amount per claim was $4,80

> A new machine has just been installed to produce printed circuit boards. One of the critical measurements is the thickness of the resistance layer. The quality control inspector randomly selects five boards each half-hour, measures the thickness, and r

> Compute Paasche’s index for 2016 using 2000 as the base period. Use the following information on food items for the years 2000 and 2016.  

> Compute Paasche’s index for 2016 using 1990 as the base period. Use the following price information for selected items for 1990 and 2016. Production figures for those two periods are also given.  

> Compute a simple aggregate price index. Use 2000 as the base period. Use the following information on food items for the years 2000 and 2016.  

> The American Water Works Association reports that the per capita water use in a single-family home is 69 gallons per day. Legacy Ranch is a relatively new housing development. The builders installed more efficient water fixtures, such as low-flush toil

> A study was conducted to determine if there was a difference in the humor content in British and American trade magazine advertisements. In an independent random sample of 270 American trade magazine advertisements, 56 were humorous. An independent ran

> A United Nations report shows the mean family income for Mexican migrants to the United States is $27,000 per year. A FLOC (Farm Labor Organizing Committee) evaluation of 25 Mexican family units reveals a mean to be $30,000 with a sample standard devia

> There are two major cell phone providers in the Colorado Springs, Colorado area, one called HTC and the other, Mountain Communications. We want to investigate the “churn rate” for each provider. Churn is the number of customers or subscribe

> For a recent year, the mean fare to fly from Charlotte, North Carolina, to Chicago, Illinois, on a discount ticket was $267. A random sample of 13 round-trip discount fares on this route last month shows: At the .01 significance level, can we

> Each month the National Association of Purchasing Managers surveys purchasing managers and publishes the NAPM index. One of the questions asked on the survey is: Do you think the economy is contracting? Last month, of the 300 responding managers, 160 a

> Listed below is the annual rate of return (reported in percent) for a sample of 12 taxable mutual funds. Using the .05 significance level, is it reasonable to conclude that the mean rate of return is more than 4.50%?  

> The following sample data were obtained from three populations where the variances were not equal, and you wish to compare the populations. a. State the null hypothesis. b. Using the .01 level of risk, state the decision rule. c. Compute the

> Compute a simple index for the revenue of GE using the period 2004–06 as the base. What can you conclude about the change in revenue over the period? Use the following information from General Electric Corporation’s annual reports.

> After a losing season, there is a great uproar to fire the head football coach. In a random sample of 200 college alumni, 80 favor keeping the coach. Test at the .05 level of significance whether the proportion of alumni who support the coach is less t

> Using the period 2000–02 as the base period, compute a simple index of the number of employees for each year from 2004 to 2015. Use the following information taken from Johnson & Johnson annual reports. The principal office of Johnson &

> The postanesthesia care area (recovery room) at St. Luke’s Hospital in Maumee, Ohio, was recently enlarged. The hope was that the change would increase the mean number of patients served per day to more than 25. A random sample of 15 days reveale

> The policy of the Suburban Transit Authority is to add a bus route if more than 55% of the potential commuters indicate they would use the particular route. A sample of 70 commuters revealed that 42 would use a proposed route from Bowman Park to the do

> A recent article in The Wall Street Journal reported that the home equity loan rate is now less than 4%. A sample of eight small banks in the Midwest revealed the following home equity loan rates (in percent): At the .01 significance level, ca

> The Greater Jacksonville, Florida, Real Estate Association claims that the median rental for three-bedroom condominiums is more than $1,200 a month. A random sample of 149 units showed 5 rented for exactly $1,200 a month, and 75 rented for more than $1

> A recent article in Vitality magazine reported that the mean amount of leisure time per week for American men is 40.0 hours. You believe this figure is too large and decide to conduct your own test. In a random sample of 60 men, you find that the mean

> The use of cellular phones in automobiles has increased dramatically in the last few years. Of concern to traffic experts, as well as manufacturers of cellular phones, is the effect on accident rates. Is someone who is using a cellular phone more likel

> 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 show the major problem areas.  

> Four brands of lightbulbs are being considered for use in the final assembly area of the Ford F-150 truck plant in Dearborn, Michigan. The director of purchasing asked for samples of 100 from each manufacturer. The numbers of acceptable and unacceptabl

> Dole Pineapple Inc. is concerned that the 16-ounce can of sliced pineapple is being overfilled. Assume the standard deviation of the process is .03 ounce. The quality-control department took a random sample of 50 cans and found that the arithmetic mean

> Using the period 2000–02 as the base period, compute a simple index of international sales for each year from 2004 to 2015. Use the following information taken from Johnson & Johnson annual reports. The principal office of Johnson & John

> Using the period 2000–02 as the base period, compute a simple index of domestic sales for each year from 2004 to 2015. Use the following information taken from Johnson & Johnson annual reports. The principal office of Johnson & Johnson i

> The National Turkey Association wants to experiment with the effects of three different feed mixtures on weight gain in poults. Because no experience exists regarding the three mixtures, no assumptions regarding the population distribution of weights e

> For many years, TV executives used the guideline that 30% of the audience were watching each of the traditional big three prime-time networks and 10% were watching cable stations on a weekday night. A random sample of 500 viewers in the Tampa–St.

> The chief of security for the Mall of the Dakotas directed a study of theft. He selected a sample of 100 boxes that had been tampered with and ascertained that, for 60 of the boxes, the missing pants, shoes, and so on were attributed to shoplifting. Fo

> Refer to Table 10–4 and the example just completed. With n = 100, σ = 400, xÌ…c = 10,078, and μ1 = 10,100, verify that the probability of a Type II error is .2912. Table 10–4  

> It has been suggested that daily production of a subassembly would be increased if better lighting were installed and background music and free coffee and doughnuts were provided during the day. Management agreed to try the scheme for a limited time. A

> The safety director of a large steel mill took samples at random from company records of minor work-related accidents and classified them according to the time the accident took place. Using the goodness-of-fit test and the .01 level of signif

> 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 of 25. Develop an OC curve for these percents defectiv

> Classic Golf Inc. manages five courses in the Jacksonville, Florida, area. The director of golf wishes to study the number of rounds of golf played per weekday at the five courses. He gathered the following sample information. At the .05 significance l

> The liquid chlorine added to swimming pools to combat algae has a relatively short shelf life before it loses its effectiveness. Records indicate that the mean shelf life of a 5-gallon jug of chlorine is 2,160 hours (90 days). As an experiment, Holdlon

> The null hypothesis and the alternate hypothesis are: H0: The frequencies are equal. H1: The frequencies are not equal. Category ______fo A ………………………. 10 B ………&h

> Given the following hypotheses: H0: μ = 100 H1: μ ≠ 100 A random sample of six resulted in the following values: 118, 105, 112, 119, 105, and 111. Assume a normal population. Using the .05 significance level, can we conclude the mean is d

> In a multiple regression analysis, two independent variables are considered, and the sample size is 25. The regression coefficients and the standard errors are as follows. b1 = 2.676 sb1 = 0.56 b2 = −0.880 sb2 = 0.71 Conduct a test of hypo

> Most air travelers now use e-tickets. Electronic ticketing allows passengers to not worry about a paper ticket, and it costs the airline companies less to handle than paper ticketing. However, in recent times the airlines have received complaints from

> Johnson Wholesale Company manufactures a variety of products. The prices and quantities produced for April 2000 and April 2017 are: Using April 2000 as the base period, find the value index of goods produced for April 2017.  

> The management of White Industries is considering a new method of assembling its golf cart. The present method requires a mean time of 42.3 minutes to assemble a cart. The mean assembly time for a random sample of 24 carts, using the new method, was 40

> Central Airlines claims that the median price of a round-trip ticket from Chicago to Jackson Hole, Wyoming, is $503. This claim is being challenged by the Association of Travel Agents, who believe the median price is less than $503. A random sample of

> Given the following hypotheses: H0: μ = 400 H1: μ ≠ 400 A random sample of 12 observations is selected from a normal population. The sample mean was 407 and the sample standard deviation 6. Using the .01 significance level: a. State the de

> The sales, in billions of dollars, of Keller Overhead Door Inc. for 2012 to 2017 are: a. Plot the data. b. Determine the least squares trend equation. c. Use the trend equation to calculate the points for 2014 and 2017. Plot them on the grap

> In January 2003, the price for a whole fresh chicken was $1.004 per pound. In February 2016, the price for the same chicken was $1.475 per pound. Use the January 2003 price as the base period and 100 as the base value to develop a simple index. By what

> The null and alternate hypotheses are: H0: π1 = π2 H1: π1 ≠ π2 A sample of 200 observations from the first population indicated that x1 is 170. A sample of 150 observations from the second population revealed x2 to be 110. Use the .05

> Many new stockbrokers resist giving presentations to bankers and certain other groups. Sensing this lack of self-confidence, management arranged to have a confidence-building seminar for a sample of new stockbrokers and enlisted Career Boosters for a t

> A sample of 60 college students was given a special training program designed to improve their time management skills. One month after completing the course, the students were contacted and asked whether the skills learned in the program were effective

> The following hypothesis-testing situation is given: H0: π = .50 and H1: π ≠ .50. The significance level is .05, and the sample size is 9. a. What is the decision rule? b. There were five successes. What is your decision regarding the null h

> The following hypotheses are given. H0: π = .40 H1: π ≠ .40 A sample of 120 observations revealed that p = .30. At the .05 significance level, can the null hypothesis be rejected? a. State the decision rule. b. Compute the value of the

> Thompson Photo Works purchased several new, highly sophisticated processing machines. The production department needed some guidance with respect to qualifications needed by an operator. Is age a factor? Is the length of service as an operator (in year

> A sample of 36 observations is selected from a normal population. The sample mean is 12, and the population standard deviation is 3. Conduct the following test of hypothesis using the .01 significance level. H0: μ ≤ 10 H1: μ > 10 (a) Is

> 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 chart. Determine the mean number of misses per mon

> 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 obligations over each of the last 36 months. Dev

> Consider the ANOVA table that follows. a. Determine the standard error of estimate. About 95% of the residuals will be between what two values? b. Determine the coefficient of multiple determination. Interpret this value. c. Determine the co

> Research at the University of Toledo indicates that 50% of students change their major area of study after their first year in a program. A random sample of 100 students in the College of Business revealed that 48 had changed their major area of study af

> Cincinnati Paint Company sells quality brands of paints through hardware stores throughout the United States. The company maintains a large sales force who call on existing customers and look for new business. The national sales manager is investigating

> The table below reports the earnings per share of common stock for Home Depot Inc. for 2003 through 2015. Develop an index, with 2003 as the base, for earnings per share for years 2004 through 2015. Year Earnings per Share Year Eamings per Share 200

> Under what conditions should the Kruskal-Wallis test be used instead of the Wilcoxon rank-sum test?

> In a particular chi-square goodness-of-fit test, there are six categories and 500 observations. Use the .01 significance level. a. How many degrees of freedom are there? b. What is the critical value of chi-square?

> Describe the difference between an attribute control chart and a variable control chart.

> Tim Waltzer owns and operates Waltzer’s Wrecks, a discount car rental agency near Cleveland Hopkins International Airport. He rents a wreck for $20 a day. He has an arrangement with Landrum Leasing to purchase used cars at $6,000 each.

> The proprietor of the newly built White Mountain Ski and Swim Lodge has been considering purchasing or leasing several snowmobiles for the use of guests. The owner found that other financial obligations made it impossible to purchase the machines. Snowmo

> The quality assurance department at Malcomb Products must either inspect each part in a lot or not inspect any of the parts. That is, there are two decision alternatives: inspect all the parts or inspect none of the parts. The proportion of parts defecti

> A financial executive for Fidelity Investments lives in Boston but frequently must travel to New York. She can go to New York by car, train, or plane. The cost for a plane ticket from Boston to New York is $200, and it is estimated that the trip takes 30

> The following regression output was obtained from a study of architectural firms. The dependent variable is the total amount of fees in millions of dollars. x1 is the number of architects employed by the company. x2 is the number of engineers employed

> 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. If more than two balls are found defective, the lot of 5

> 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 the sampling plan, what is the probability that a lot

> Christina Sanders is a member of the women’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 summer camp devoted to shooting techniques.

> 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? What is the R2 value? Is it large? Look at the p-values for each of the independent vari

> 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, forecast the net sales for 2016 and 2017. Use the follow

> The enrollment in the College of Business at Midwestern University by quarter from 2013 to spring 2017 is: Using the ratio-to-moving-average method: a. Determine the four quarterly indexes. b. Interpret the quarterly pattern of enrollment. Does the sea