Starting teachers salaries (in equivalent U.S. dollars) for upper secondary education in selected countries are listed below. Which set of data is more variable? (The U.S. average starting salary at...

A recent national survey found that high school students watched an average (mean) of 6.8 DVDs per month with a population standard deviation of 1.8. The distribution of DVDs watched per month...

The average mpg usage for a 2009 Toyota Prius for a sample of 10 tanks of gas was 45.5 with a standard deviation of 1.8. For a 2009 Honda Insight, the average mpg usage for a sample of 10 tanks of...

Forest Green Brown, Inc., produces bags of cypress mulch. The weight in pounds per bag varies, as indicated in the accompanying table. a. Graph the probability distribution. b. Calculate and graph...

The Webster National Bank is reviewing its service charges and interest-paying policies on checking accounts. The average daily balance on personal checking accounts is $550, with a standard...

A university found that 20% of its students withdraw without completing the introductory statistics course. Assume that 20 students registered for the course. a. Compute the probability that 2 or...

Recent research has demonstrated that music-based physical training for elderly people can improve balance and walking efficiency and reduce the risk of falls (Trombetti et al., 2011). As part of the...

A silver dollar is flipped twice. Calculate the probability of each of the following occurring: (a) A head on the first flip (b) A tail on the second flip given that the first toss was a head (c) Two...

A shareholders group, in lodging a protest, claimed that the mean tenure for a chief exective office (CEO) was at least nine years. A survey of companies reported in The Wall Street Journal found a...

The Center for Medicare and Medical Services reported that there were 295,000 appeals for hospitalization and other Part A Medicare service. For this group, 40% of first-round appeals were successful...

In preparing for the upcoming holiday season, Mandrell Toy Company designed a new doll called Freddy. The fixed cost to produce the doll is $100,000. The variable cost, which includes material,...

Andy Lange, president of the University of South Wisconsin, is concerned with the declining business at the University Book Store. The students tell him that the prices are simply too high. Andy,...

Fowle Marketing Research, Inc., bases charges to a client on the assumption that telephone surveys can be completed in a mean time of 15 minutes or less. If a longer mean survey time is necessary, a...

A company that builds sailboats wants to determine how many sailboats to build during each of the next four quarters. The demand during each of the next four quarters is as follows: first quarter,...

Figure shows a cylindrical tank with a conical base. If the liquid level is quite low in the conical part, the volume is simply the conical volume of liquid. If the liquid level is midrange in the...

Katherine D'Ann is planning to finance her college education by selling programs at the football games for State University. There is a fixed cost of $400 for printing these programs, and the...

An investor bought common stock of Microsoft Corporation on three occasions at the following prices. Calculate the average price per share at which the investor bought these shares. Date January 2009...

Cookie Monster Inc. is a company that specializes in the development of software that tracks Web browsing history of individuals. A sample of browser histories is provided in the file CookieMonster....

In 2008 the Better Business Bureau settled 75% of complaints they received (USA Today, March 2, 2009). Suppose you have been hired by the Better Business Bureau to investigate the complaints they...

In a group of adults, some own iPads, and others do not. If two adults are randomly selected from this group, how many total outcomes are possible? Draw a tree diagram for this experiment.

The Dow Jones Industrial Average (DJIA) and the Standard & Poors 500 (S&P 500) indexes are used as measures of overall movement in the stock market. The DJIA is based on the price movements of 30...

Fortune magazine reported the results of a survey on executive training that was conducted by the Association of Executive Search Consultants. The survey showed that 75 percent of 300 polled CEOs...

Listed below are speeds (mi/h) measured from southbound traffic on I-280 near Cupertino, California (based on data from SigAlert). dhis simple random sample was obtained at 3:30 p.m. on a weekday....

A candidate for mayor in a small town has allocated $40,000 for last-minute advertising in the days preceding the election. Two types of ads will be used: radio and television. Each radio ad costs...

During the summer at a small private airport in western Nebraska, the unscheduled arrival of airplanes is Poisson distributed with an average arrival rate of 1.12 planes per hour. a. What is the...

The electric power consumed each month by a chemical plant is thought to be related to the average ambient temperature (x1), the number of days in the month (x2), the average product purity (x3), and...

MSA Computer Corporation manufactures two models of minicomputers, the Alpha 4 and the Beta 5. The firm employs five technicians, working 160 hours each per month, on its assembly line. Management...

Sam Easton started out as a real estate agent in Atlanta ten years ago. After working two years for a national real estate firm, he transferred to Dallas, Texas, and worked for another realty agency....

Describe briefly the steps used to develop a forecasting system.

The figure illustrates two sampling distributions for sample proportions when the population proportion p = 0.50. a. Find the standard deviation for the sampling distribution of the sample proportion...

Recent research suggests that 73% of Americans have a home phone, 83% have a cell phone, and 58% of people have both. What is the probability that an American has a) A home or cell phone? b) Neither...

What was the approximate net change from April 29 to April 30? Express that net change as a monetary amount and as a percent to the nearest tenth. WPO Daily - 695 690 685 680 675 670 665 660 655 650...

Boats Use x = 85 (for 850,000 registered boats) with a 99% confidence level? Use the paired data consisting of registered Florida boats (tens of thousands) and manatee fatalities from boat encounters...

In a Harris poll of 514 human resource professionals, 45.9% said body piercings and tattoos were big grooming redflags. a. Among the 514 human resource professionals who were surveyed, how many of...

An article in the Journal of Sound and Vibration (Vol. 151, 1991, pp. 383394) described a study investigating the relationship between noise exposure and hypertension. The following data are...

Health insurance benefits vary by the size of the company (Atlanta Business Chronicle, December 31, 2010). The sample data below show the number of companies providing health insurance for small,...

Fewer young people are driving. In 1983, 87% of 19-year-olds had a drivers license. Twenty-five years later that percentage had dropped to 75% (University of Michigan Transportation Research...

Management of the First Syracuse Bank is concerned about a loss of customers at its main office downtown. One solution that has been proposed is to add one or more drive-through teller stations to...

Jean Clark is the manager of the Midtown Saveway Grocery Store. She now needs to replenish her supply of strawberries. Her regular supplier can provide as many cases as she wants. However, because...

A small hotel in a popular resort area has 20 rooms. The hotel manager estimates that 15% of all confirmed reservations are no-shows. Consequently, the hotel accepts confirmed reservations for as...

The wheat harvesting season in the American Midwest is short, and most farmers deliver their truckloads of wheat to a giant central storage bin within a two-week span. Because of this, wheat-filled...

Concur Technologies, Inc., is a large expense-management company located in Redmond, Washington. The Wall Street Journal asked Concur to examine the data from 8.3 million expense reports to provide...

A large philanthropic organization keeps records on the people who have contributed to their cause. In addition to keeping records of past giving, the organization buys demographic data on...

The Pew Research Center has conducted extensive research on the young adult population (Pew research website, November 6, 2012). One finding was that 93% of adults aged 18 to 29 use the Internet....

A manufacturer of detergent claims that the contents of boxes sold weigh on average at least 16 ounces. The distribution of weight is known to be normal, with a standard deviation of 0.4 ounce. A...

Hart Manufacturing makes three products. Each product requires manufacturing operations in three departments: A, B, and C. The labor-hour requirements, by department, are as follows: During the next...

If, in Example 4, one molecule of the product C is formed from one molecule of the reactant A and one molecule of the reactant B, and the initial concentrations of A and B have a common value [A] =...

A sample containing years to maturity and yield (percent) for 40 corporate bonds are contained in the data file named CorporateBonds (Barrons, April 2, 2012). a. Develop a scatter chart of the data...

A recent survey of 992 people asked: In which professional sportfootball, boxing, hockey, or martial artsis an athlete most likely to sustain an injury that will affect the athlete after he or she...

A lot of 50 spacing washers contains 30 washers that are thicker than the target dimension. Suppose that three washers are selected at random, without replacement, from the lot. (a) What is the...

Refer to Problem 21. Assume that management desires a 12-day project completion time. a. Formulate a linear programming model that can be used to assist with the crashing decisions. b. What...

Based on a Harris Interactive poll, 20% of adults believe in reincarnation. Assume that six adults are randomly selected, and find the indicated probability. a. What is the probability that exactly...

Sixty-three percent of U.S. adults oppose special taxes on junk food and soda. You randomly select 10 U.S. adults. Find the probability that the number of U.S. adults who oppose special taxes on junk...

In a recent USA TODAY/Gallup Poll, respondents favored Barack Obama over Mitt Romney in terms of likeability, 60% to 30% (Los Angeles Times, July 28, 2012). The following bar chart summarizes the...

In exercise 3, the following estimated regression equation based on 30 observations was presented. y = 17.6 + 3.8x1 2.3x2 + 7.6x3 + 2.7x4 The values of SST and SSR are 1805 and 1760, respectively....

An Oklahoma manufacturer makes two products: speaker telephones (X1) and pushbutton telephones (X2). The following goal programming model has been formulated to find the number of each to produce...

Using PERT, Ed Rose was able to determine that the expected project completion time for the construction of a pleasure yacht is 21 months and the project variance is 4. (a) What is the probability...

For a large supermarket chain in Florida, a womens group claimed that female employees were passed over for management training in favor of their male colleagues. The company denied this claim,...

Merrill Lynch recently completed a study regarding the size of online investment portfolios (stocks, bonds, mutual funds, and certificates of deposit) for a sample of clients in the 40 up to 50 years...

First-time patients at North Shore Family Practice are required to fill out a questionnaire that gives the doctor an overall idea of each patients health. The first question is: In general, what is...

Indicate which of the following represent independent events. Explain briefly. a) Prices of houses on the same block. b) Successive measurements of your heart rate as you exercise on a treadmill. c)...

A molding process uses a five-cavity mold for a part used in an automotive assembly. The wall thickness of the part is the critical quality characteristic. It has been suggested to use X and R charts...

A snowmobile manufacturer produces three models, the XJ6, the XJ7, and the XJ8. In any given production-planning week, the company has 40 hours available in its final testing bay. Each XJ6 requires 1...

The figure shows two circles C and D of radius 1 that touch at P.T is a common tangent line; C1 is the circle that touches C, D, and T; C2 is the circle that touches C, D, and C1; C3 is the circle...

On a laboratory assignment, if the equipment is working, the density function of the observed outcome, X is (a) Calculate P(X? (b) What is the probability that X will exceed 0.5? (c) Given that X >...

From a 3M Privacy Filters poll in which respondents were asked to identify their favorite seat when they fly: n = 806, x = 492 who chose the window seat. Use a 99% confidence level. Use the given...

A sample space, S, yields four simple events, A, B, C, and D, such that P(A) = 0.35 , P(B) = 0.10 and P(C) = 0.25. a. Find P(D). b. Find P(Cc). c. Find P(A B).

Weight in carats of an uncut diamond Classify the variable as qualitative or quantitative. If the variable is quantitative, state whether it is discrete or continuous.

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...

The lengths of plate glass parts are measured to the nearest tenth of a millimeter. The lengths are uniformly distributed, with values at every tenth of a millimeter starting at 590.0 and continuing...

Embassy Motorcycles (EM) manufacturers two lightweight motorcycles designed for easy handling and safety. The EZ-Rider model has a new engine and a low profile that make it easy to balance. The...

An intern is working for Pacific TV (PTV), a small cable and Internet provider, and has proposed some questions that might be used in the survey to assess whether customers are willing to pay $50 for...

Farm Grown, Inc., produces cases of perishable food products. Each case contains an assortment of vegetables and other farm products. Each case costs $5 and sells for $15. If there are any cases not...

The management of Brinkley Corporation is interested in using simulation to estimate the profit per unit for a new product. The selling price for the product will be $45 per unit. Probability...

The diameter of cotter pins produced by an automatic machine is a characteristic of interest. Based on historical data, the process average diameter is 15 mm with a process standard deviation of 0.8...

Shown below are the per diem business travel expenses in 11 international cities listed by Business Affairs of Oregon State University. Use this list to calculate the z scores for Moscow, Beijing,...

A textile manufacturer obtained a sample of 50 bolts of cloth from a day's output. Each bolt is carefully inspected and the number of imperfections is recorded as follows: Find the mean, median, and...

A salesman normally makes a sale (closes) on 80% of his presentations. Assuming the presentations are independent, find the probability of each of the following. a) He fails to close for the first...

To generate leads for new business, Gustin Investment Services offers free financial planning seminars at major hotels in Southwest Florida. Gustin conducts seminars for groups of 25 individuals....

On a hospital staff, there are 4 dermatologists, 7 surgeons, 5 general practitioners, 3 psychiatrists, and 3 orthopedic specialists. If a doctor is selected at random, find the probability that the...

A certain raw material is classified as to moisture content X (in percent) and impurity Y (in percent). Let X and Y have the joint pmf given by (a) Find the marginal pmfs, the means, and the...

A small motor manufacturer makes two types of motor, models A and B. The assembly process for each is similar in that both require a certain amount of wiring, drilling, and assembly. Each model A...

A message can follow different paths through servers on a network. The senders message can go to one of five servers for the first step, each of them can send to five servers at the second step, each...

The probability distribution of X, the number of imperfections per 10 meters of a synthetic fabric in continuous rolls of uniform width, is given in Exercise 3.13 as Find the average number of...

Ten weeks of data on the Commodity Futures Index are 7.35, 7.40, 7.55, 7.56, 7.60, 7.52, 7.52, 7.70, 7.62, and 7.55. a. Compute the exponential smoothing values for = 0.2. b. Compute the exponential...

From 10 men and 8 women in a pool of potential jurors, 12 are chosen at random to constitute a jury. Suppose that you observe the number of men who are chosen for the jury. Let A be the event that at...

Consider the synthetic fiber in the previous exercise. How is the standard deviation of the sample mean changed when the sample size is increased from n = 6 to n = 49?

A tank is full of water. Find the work required to pump the water out of the outlet. In Exercises 23 and 24 use the fact that water weighs 62.5 lb/ft3. 21. 22. Im - 3 m - 2 m 3 m 1.5 m 6 m 23. 24. E...

Can you use Twitter activity to forecast box office receipts on the opening weekend? The following data (stored in Twitter Movies) indicate the Twitter activity ( want to see) and the receipts ($)...

Nondestructive evaluation (NDE) describes methods that quantitatively characterize materials, tissues, and structures by noninvasive means, such as X-ray computed tomography, ultrasonics, and...

An article in the ACI Materials Journal (Vol. 84, 1987, pp. 213216) describes several experiments investigating the rodding of concrete to remove entrapped air. A 3-inch x 6-inch cylinder was used,...

An article in the Journal of the Electrochemical Society (Vol. 139, No. 2, 1992, pp. 524532) describes an experiment to investigate the low-pressure vapor deposition of polysilicon. The experiment...

An analyst at a local bank wonders if the age distribution of customers coming for service at his branch in town is the same as at the branch located near the mall. He selects 100 transactions at...

Some of the pioneers of calculus, such as Kepler and Newton, were inspired by the problem of finding the volumes of wine barrels. (In fact Kepler published a book Stereometria doliorum in 1715...

Two television stations in a market compete with each other for viewing audience. Local programming options for the 5:00 P.M. weekday time slot include a sitcom rerun, an early news program, or a...

A parking control officer is conducting an analysis of the amount of time left on parking meters. A quick survey of 15 cars that have just left their metered parking spaces produced the following...

A TiW layer is deposited on a substrate using a sputtering tool. Table 6E.14 contains layer thickness measurements (in angstroms) on 20 subgroups of four substrates. (a) Setup x and R control charts...

The data set 401KSUBS.RAW contains information on net financial wealth (nettfa), age of the survey respondent (age), annual family income (inc), family size (fsize), and participation in certain...

Benson Electronics manufactures three components used to produce cell telephones and other communication devices. In a given production period, demand for the three components may exceed Bensons...

A major traffic problem in the Greater Cincinnati area involves traffic attempting to cross the Ohio River from Cincinnati to Kentucky using Interstate 75. Let us assume that the probability of no...