Employee suggestions can provide useful and insightful ideas for management. Some companies solicit and receive employee suggestions more than others, and company culture influences the use of employee suggestions. Suppose a study is conducted to determine whether there is a significant difference in mean number of suggestions per year per employee between the Canon Corporation and the Pioneer Electronic Corporation. The study shows that the average number of suggestions per year per employee is 1.3 at Canon and 1.0 at Pioneer. Suppose these figures were obtained from random samples of 36 and 45 employees, respectively. If the population standard deviations of suggestions per employee are 0.7 and 0.4 for Canon and Pioneer, respectively, is there a significant difference in the population means? Use ( = .05.
> You are asked to analyze a completely randomized design that has six treatment levels and a total of 42 measurements. Complete the following table, which contains some information from the study.
> What proportion of pizza restaurants that are primarily for walk-in business have a salad bar? Suppose that, in an effort to determine this figure, a random sample of 1250 of these restaurants across the United States based on the Yellow Pages is called.
> Complete the following ANOVA table.
> Compute a one-way ANOVA on the following data. Use α = .05. If there is a significant difference in treatment levels, use Tukey’s HSD to compute multiple comparisons. Let α = .05 for the multiple comparisons.
> Finish the computations in the Minitab ANOVA table shown below and determine the critical table F values. Interpret the analysis. Discuss this problem, including the structure of the design, the sample sizes, and decisions about the hypotheses. Analysis
> Consider the valve opening data displayed in Table 11.1. Suppose the data represent valves produced on four different machines on three different shifts and that the quality controllers want to know whether there is any difference in the mean measurement
> Study the following ANOVA table produced by using Minitab. Describe the design (number of treatments, sample sizes, etc.). Are there any significant effects? Discuss the output. Analysis of Variance for DV
> A shoe retailer conducted a study to determine whether there is a difference in the number of pairs of shoes sold per day by stores according to the number of competitors within a 1-mile radius and the location of the store. The company researchers selec
> Children are generally believed to have considerable influence over their parents in the purchase of certain items, particularly food and beverage items. To study this notion further, a study is conducted in which parents are asked to report how many foo
> Suppose the following data have been gathered from a study with a two-way factorial design. Use α = .05 and a two-way ANOVA to analyze the data. State your conclusions.
> The data gathered from a two-way factorial design follow. Use the two-way ANOVA to analyze these data. Let α = .01.
> Is there a difference in the family demographics of people who stay at motels? Suppose a study is conducted in which three categories of motels are used: economy motels, modestly priced chain motels, and exclusive motels. One of the dependent variables s
> According to the Stern Marketing Group, 9 out of 10 professional women say that financial planning is more important today than it was five years ago. Where do these women go for help in financial planning? Forty-seven percent use a financial advisor (br
> Complete the following two-way ANOVA table. Determine the critical table F values and reach conclusions about the hypotheses for effects. Let α = .05.
> Complete the following two-way ANOVA table. Determine the critical table F values and reach conclusions about the hypotheses for effects. Let α = .05.
> Describe the following factorial design. How many independent and dependent variables are there? How many levels are there for each treatment? If the data were known, could interaction be determined from this design? Compute all degrees of freedom. Each
> Describe the following factorial design. How many independent and dependent variables are there? How many levels are there for each treatment? If the data were known, could interaction be determined from this design? Compute all degrees of freedom. Each
> The comptroller of a company is interested in determining whether the average length of long-distance calls by managers varies according to type of telephone. A randomized block design experiment is set up in which a long-distance call by each of five ma
> As part of a manufacturing process, a plastic container is supposed to be filled with 46 ounces of saltwater solution. The plant has three machines that fill the containers. Managers are concerned that the machines might not be filling the containers wit
> In recent years, the debate over the U.S. economy has been constant. The electorate seems somewhat divided as to whether the economy is in a recovery or not. Suppose a survey was undertaken to ascertain whether the perception of economic recovery differs
> Safety in motels and hotels is a growing concern among travelers. Suppose a survey was conducted by the National Motel and Hotel Association to determine U.S. travelers’ perception of safety in various motel chains. The association chos
> A randomized block design has a treatment variable with four levels and a blocking variable with seven blocks. Using this information and α = .01, complete the following table and reach a conclusion about the null hypothesis.
> A randomized block design has a treatment variable with six levels and a blocking variable with 10 blocks. Using this information and α = .05, complete the following table and reach a conclusion about the null hypothesis.
> According to Music and Copyright, 2017, Universal Music Group is the music leader in combined physical and digital recorded music trade revenue. Suppose a business analyst wants to determine what market share the company holds in the city of St. Louis by
> A large multinational banking company wants to determine whether there is a significant difference in the average dollar amounts purchased by users of different types of credit cards. Among the credit cards being studied are MasterCard, Visa, Discover, a
> The following data were gathered from a randomized block design. Use α = .01 to test for a significant difference in the treatment levels. Establish the hypotheses and reach a conclusion about the null hypothesis.
> Use ANOVA to analyze the data from the randomized block design given here. Let α = .05. State the null and alternative hypotheses and determine whether the null hypothesis is rejected.
> Problem 11.16 analyzed the number of weekly hours worked per person at five different plants. An F value of 3.10 was obtained with a probability of .0266. Because the probability is less than .05, the null hypothesis is rejected at α = .05.
> Do multiple comparisons on the data in Problem 11.14 using Tukey’s HSD test and α = .05. State which pairs of cities, if any, have significantly different mean costs.
> Using α = .05, compute critical values using the Tukey-Kramer procedure for the pairwise groups in Problem 11.13. Determine which pairs of groups are significantly different, if any.
> Use Tukey’s HSD test to compute multiple comparisons for the data in Problem 11.12. Let α = .01. State which regions, if any, are significantly different from other regions in mean starting salary figures.
> Use the Tukey-Kramer procedure to do multiple comparisons for Problem 11.11. Let α = .01. State which pairs of machines, if any, produce significantly different mean fills.
> Using Problem 11.8, compute Tukey’s HSD and determine whether there is a significant difference in means by using this methodology. Let α = .05.
> Using the results from Problem 11.7, compute a Tukey’s HSD to determine whether there are any significant differences between group means. Let α = .01.
> Suppose a random sample of 85 items has been taken from a population and 40 of the items contain the characteristic of interest. Use this information to calculate a 90% confidence interval to estimate the proportion of the population that has the charact
> Use the Tukey-Kramer procedure to determine whether there is a significant difference between the means of groups 2 and 5 in Problem 11.6. Let α = .01.
> Southwest Airlines is able to keep fares low, in part because of relatively low maintenance costs on its airplanes. One of the main reasons for the low maintenance costs is that Southwest flies only one type of aircraft, the Boeing 737. However, Southwes
> Using the results of Problem 11.5, compute a critical value by using the Tukey-Kramer procedure for groups 1 and 2. Use α = .05. Determine whether there is a significant difference between these two groups.
> A completely randomized design has been analyzed by using a one-way ANOVA. There are four treatment groups in the design, and each sample size is six. MSE is equal to 2.389. Using α = .05, compute Tukey’s HSD for this ANOVA.
> Suppose an ANOVA has been performed on a completely randomized design containing six treatment levels. The mean for group 3 is 15.85, and the sample size for group 3 is eight. The mean for group 6 is 17.21, and the sample size for group 6 is seven. MSE i
> Business is very good for a chemical company. In fact, it is so good that workers are averaging more than 40 hours per week at each of the chemical company’s five plants. However, management is not certain whether there is a difference
> Shown here is the Minitab output for a one-way ANOVA. Analyze the results. Include the number of treatment levels, the sample sizes, the F value, the overall statistical significance of the test, and the values of the means. Analysis of Variance Means
> Family transportation costs are usually higher than most people believe because those costs include car payments, insurance, fuel costs, repairs, parking, and public transportation. Twenty randomly selected families in four major cities are asked to use
> A management consulting company presents a three-day seminar on project management to various clients. The seminar is basically the same each time it is given. However, sometimes it is presented to high-level managers, sometimes to midlevel managers, and
> That the starting salaries of new accounting graduates would differ according to geographic regions of the United States seems logical. A random selection of accounting firms is taken from three geographic regions, and each is asked to state the starting
> Use the following sample information to calculate the confidence interval to estimate the population proportion. Let x be the number of items in the sample having the characteristic of interest. a) n = 116 and x = 57, with 99% confidence b) n = 800 and x
> A milk company has four machines that fill gallon jugs with milk. The quality-control manager is interested in determining whether the average fill for these machines is the same. The following data represent random samples of fill measures (in quarts) f
> Suppose you are using a completely randomized design to study some phenomenon. There are three treatment levels and a total of 17 people in the study. Complete the following ANOVA table. Use α = .05 to find the table F value and use the dat
> Some New York Stock Exchange analysts believe that 24-hour trading on the stock exchange is the wave of the future. As an initial test of this idea, the New York St Exchange opened two after-hour “crossing sections” in the early 1990s and studied the res
> Suppose a market analyst wants to determine the difference in the average price of a gallon of whole milk in Seattle and Atlanta. To do so, he takes a telephone survey of 21 randomly selected consumers in Seattle who have purchased a gallon of milk and a
> A manufacturing company produces plastic pipes that are specified to be 10 inches long and 1/8 inch thick with an opening of 3/4 inch. These pipes are molded on two different machines. To maintain consistency, the company periodically randomly selects pi
> A large manufacturing company produces computer printers that are distributed and sold all over the United States. Due to lack of industry information, the company has a difficult time ascertaining its market share in different parts of the country. They
> Why do employees “blow the whistle” on other employees for unethical or illegal behavior? One study conducted by the AICPA reported the likelihood that employees would blow the whistle on another employee for such thin
> Information presented by GraphicSprings showed some of the highest and the lowest global rental rates per year per square foot of office space. Among the cities with the lowest rates were Houston, Riyadh, Melbourne, Amsterdam, and Bengaluru, with rental
> For the two large newspapers in your city, you are interested in knowing whether there is a significant difference in the average number of pages in each dedicated solely to advertising. You randomly select 10 editions of newspaper A and 6 editions of ne
> Use the information about each of the following samples to compute the confidence interval to estimate p. a) n = 44 and p^ = .51; compute a 90% confidence interval. b) n = 300 and p^ =.82; compute a 95% confidence interval. c) n = 1150 and p^ = .48; comp
> One of the thrusts of quality-control management is to examine the process by which a product is produced. This approach also applies to paperwork. In industries where large long-term projects are undertaken, days and even weeks may elapse as a change or
> A company’s auditor believes the per diem cost in Nashville, Tennessee, rose significantly between 2008 and 2019. To test this belief, the auditor samples 51 business trips from the company’s records for 2008; the sample average was $212 per day, with a
> Various types of retail outlets sell toys during the holiday season. Among them are specialty toy stores, large discount toy stores, and other retailers that carry toys as only one part of their stock of goods. Is there any difference in the dollar amoun
> Executives often spend so many hours in meetings that they have relatively little time to manage their individual areas of operation. What is the difference in mean time spent in meetings by executives of the aerospace industry and executives of the auto
> Is there a difference in the proportion of construction workers who are under 35 years of age and the proportion of telephone repair people who are under 35 years of age? Suppose a study is conducted in Calgary, Alberta, using random samples of 338 const
> A manufacturer uses two machines to drill holes in pieces of sheet metal used in engine construction. The workers who attach the sheet metal to the engine become inspectors in that they reject sheets so poorly drilled that they cannot be attached. The pr
> In manufacturing, does worker productivity drop on Friday? In an effort to determine whether it does, a company’s personnel analyst randomly selects from a manufacturing plant five workers who make the same part. He measures their outpu
> As the prices of heating oil and natural gas increase, consumers become more careful about heating their homes. Analysts want to know how warm homeowners keep their houses in January and how the results from Wisconsin and Tennessee compare. The analysts
> What is the average difference between the price of name-brand soup and the price of store-brand soup? To obtain an estimate, an analyst randomly samples eight stores. Each store sells its own brand and a national name brand. The prices of a can of name-
> Is there more variation in the output of one shift in a manufacturing plant than in another shift? In an effort to study this question, plant managers gathered productivity reports from the 8 A.M. to 4 P.M. shift for eight days. The reports indicated tha
> Cycle time in manufacturing can be viewed as the total time it takes to complete a product from the beginning of the production process. The concept of cycle time varies according to the industry and product or service being offered. Suppose a boat manuf
> A candy company fills a 20-ounce package of Halloween candy with individually wrapped pieces of candy. The number of pieces of candy per package varies because the package is sold by weight. The company wants to estimate the number of pieces per package.
> One of the most important aspects of a store’s image is the perceived quality of its merchandise. Other factors include merchandise pricing, assortment of products, convenience of location, and service. Suppose image perceptions of shoppers of specialty
> A tree nursery has been experimenting with fertilizer to increase the growth of seedlings. A sample of 35 two-year-old pine trees is grown for three more years with a cake of fertilizer buried in the soil near the trees’ roots. A second
> The Bureau of Labor Statistics shows that the average insurance cost to a company per hour worked for an employee by major industry group is $3.22 for construction workers and $3.97 for manufacturing workers. Suppose these figures were obtained from 14 c
> A national grocery store chain wants to test the difference in the average weight of turkeys sold in Detroit and the average weight of turkeys sold in Charlotte. According to the chain’s analyst, a random sample of 20 turkeys sold at the chain’s stores i
> A study was conducted to develop a scale to measure stress in the workplace. Respondents were asked to rate 26 distinct work events. Each event was to be compared with the stress of the first week on the job, which was awarded an arbitrary score of 500.
> A study was conducted to compare the salaries of accounting clerks and data entry operators. One of the hypotheses to be tested is that the variability of salaries among accounting clerks is the same as the variability of salaries of data entry operators
> There are several methods used by people to organize their lives in terms of keeping track of appointments, meetings, and deadlines. Some of these include using a desk calendar, using informal notes of scrap paper, keeping them “in your head,” using a da
> A study is conducted to estimate the average difference in bus ridership for a large city during the morning and afternoon rush hours. The transit authority’s analyst randomly selects nine buses because of the variety of routes they rep
> Suppose a large insurance company wants to estimate the difference between the average amount of term life insurance purchased per family and the average amount of whole life insurance purchased per family. To obtain an estimate, one of the companyâ
> Test the following hypotheses by using the given data. Let alpha = .05.
> How much experience do supply-chain transportation managers have in their field? Suppose in an effort to estimate this, 41 supply-chain transportation managers are surveyed and asked how many years of managerial experience they have in transportation. Su
> Use the following data to construct a 99% confidence interval to estimate p1 – p2.
> Test the following hypotheses by using the given data and alpha equal to .05. H0: p1 − p2 = 0 Ha: p1 − p2 ≠0
> Use the following data to construct a 99% confidence interval to estimate D. Assume the differences are normally distributed in the population.
> Suppose you own a plumbing repair business and employ 15 plumbers. You are interested in estimating the difference in the average number of calls completed per day between two of the plumbers. A random sample of 40 days of plumber A’s work results in a s
> The following data have been gathered from two related samples. The differences are assumed to be normally distributed in the population. Use these data and alpha of .01 to test the following hypotheses. H0: D = 0 Ha: D < 0 n = 21, d̅ =−1.16, sd = 1.01
> Construct a 95% confidence interval to estimate μ1 – μ2 by using the following data. Assume the populations are normally distributed.
> The following data come from independent samples drawn from normally distributed populations. Use these data to test the following hypotheses. Let the Type I error rate be .05. H0: μ1 − μ2 = 0 Ha: Î&fra
> Use the following data to construct a 98% confidence interval to estimate the difference between μ1 and μ2.
> Test the following hypotheses with the data given. Let α = .10. H0: μ1 − μ2 = 0 Ha: μ1 − μ2 ≠0
> According to the General Accounting Office of the U.S. government, the average age of a male federal worker is 43.6 years and that of a male worker in the nonfederal sector is 37.3 years. Is there any difference in the variation of ages of men in the fed
> Suppose a company from the United States does considerable business in the city of Johannesburg, South Africa, and wishes to establish a per diem rate for employee travel to that city. The company researcher is assigned this task, and in an effort to det
> One recent study showed that the average annual amount spent by an East Coast household on frankfurters was $23.84 compared with an average of $19.83 for West Coast households. Suppose a random sample of 11 East Coast households showed that the standard
> How long are resale houses on the market? One survey by the Houston Association of Realtors reported that in Houston, resale houses are on the market an average of 112 days. Of course, the length of time varies by market. Suppose random samples of 13 hou
> Suppose the data shown here are the results of a survey to investigate gasoline prices. Ten service stations were selected randomly in each of two cities and the figures represent the prices of a gallon of unleaded regular gasoline on a given day. Use th
> Test the following hypotheses by using the given sample information and α = .05. Assume the populations are normally distributed.
> The Trade Show Bureau conducted a survey to determine why people go to trade shows. The respondents were asked to rate a series of reasons on a scale from 1 to 5, with 1 representing little importance and 5 representing great importance. One of the reaso
> Test the following hypotheses by using the given sample information and α = .01. Assume the populations are normally distributed.
> Many Americans spend time worrying about paying their bills. A survey by Fleishman Hilliard Research for MassMutual discovered that 60% of Americans with kids say that paying bills is a major concern. This proportion compares to 52% of Americans without
> According to a CCH Unscheduled Absence survey, 9% of small businesses use telecommuting of workers in an effort to reduce unscheduled absenteeism. This proportion compares to 6% for all businesses. Is there really a significant difference between small b
> A large production facility uses two machines to produce a key part for its main product. Inspectors have expressed concern about the quality of the finished product. Quality-control investigation has revealed that the key part made by the two machines i
> Companies that recently developed new products were asked to rate which activities are most difficult to accomplish with new products. Options included such activities as assessing market potential, market testing, finalizing the design, developing a bus
