According to the Internal Revenue Service, the mean tax refund for the year 2013 was $3,000. Assume the standard deviation is $450 and that the amounts refunded follow a normal probability...
The Dow Jones Travel Index reported what business travelers pay for hotel rooms per night in major U.S. cities (The Wall Street Journal, January 16, 2004). The average hotel room rates for 20 cities...
The U.S. Census Bureau serves as the leading source of quantitative data about the nation's people and economy. The following cross tabulation shows the number of households (1000s) and the household...
The seasonal yield of olives in a Piraeus, Greece vineyard is greatly influenced by a process of branch pruning. If olive trees are pruned every two weeks, output is increased. The pruning process,...
A metropolitan childrens museum open year-round wants to see if the variance in daily attendance differs between the summer and winter months. Random samples of 30 days each were selected and showed...
In the past few years, the traffic problems in Lynn McKells hometown have gotten worse. Now, Broad Street is congested about half the time. The normal travel time to work for Lynn is only 15 minutes...
1. Conduct a hypothesis test for each sample at the .01 level of significance and determine what action, if any, should be taken. Provide the test statistic and p-value for each test. 2. Compute the...
Two carts, A and B, are connected by a rope 39 ft long that passes over a pulley P (see the figure). The point Q is on the floor 12 ft directly beneath P and between the carts. Cart A is being pulled...
A Phoenix Wealth Management/Harris Interactive survey of 1500 individuals with net worth of $1 million or more provided a variety of statistics on wealthy people (BusinessWeek, September 22, 2003)....
The Chamber of Commerce in a Canadian city has conducted an evaluation of 300 restaurants in its metropolitan area. Each restaurant received a rating on a 3-point scale on typical meal price (1 least...
Develop a trend line for the demand for fertilizer in Problem 5-15, using any computer software.
Western University has only one womens softball scholarship remaining for the coming year. The final two players that Western is considering are Allison Fealey and Emily Janson. The coaching staff...
An investigation of the properties of bricks used to line aluminum smelter pots was published in The American Ceramic Society Bulletin (Feb. 2005). Six different commercial bricks were evaluated. The...
Brilliant Color is a small supplier of chemicals and equipment that are used by some photographic stores to process 35mm film. One product that Brilliant Color supplies is BC-6. John Kubick,...
A machine that is programmed to package 1.20 pounds of cereal is being tested for its accuracy. In a sample of 36 cereal boxes, the sample mean filling weight is calculated as 1.22 pounds. The...
ABC Inc. and XYZ Co. are the two dominant companies providing chargers, adapters, and other accessories for cell phones. Each of these Silicon Valley companies is developing a new line of smartphone...
A producer of a certain type of electronic component ships to suppliers in lots of twenty. Suppose that 60% of all such lots contain no defective components, 30% contain one defective component, and...
In Problem 12.7 on page 424, you used the plate gap on the bag sealing equipment to predict the tear rating of a bag of coffee. Perform a residual analysis for these data (stored in Starbucks). Based...
Daniel Grady is the financial advisor for a number of professional athletes. An analysis of the long-term goals for many of these athletes has resulted in a recommendation to purchase stocks with...
The Bureau of Transportation Statistics reports on-time performance for airlines at major U.S. airports. JetBlue, United, and US Airways share terminal C at Bostons Logan Air-port. The percentages of...
In a quality control test of parts manufactured at Dabco Corporation, an engineer sampled parts produced on the first, second, and third shifts. The research study was designed to determine if the...
A process that produces titanium forgings for automobile turbocharger wheels is to be controlled through the use of a fraction nonconforming chart. Initially, one sample of size 150 is taken each day...
Refer to the DJIA data in Problem 5- 39. In Problem 5-39, The following table provides the Dow Jones Industrial Average (DJIA) opening index value on the first working day of 19942013: Develop a...
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,...
The graph of is shown. Estimate f-3 g(x) dx with six subintervals using (a) Right endpoints, (b) Left endpoints, and (c) Midpoints.
In a survey of 529 travelers, 386 said that location was very important and 323 said that room quality was very important in choosing a hotel. a. Construct a 95% confidence interval estimate for the...
An analyst estimates that the probability of default on a seven-year AA-rated bond is 0.06, while that on a seven-year A-rated bond is 0.13. The probability that they will both default is 0.04. a....
Promotion has been the target of considerable criticism. What specific types of promotion are probably the object of this criticism? Give a particular example that illustrates your thinking.
A boarding stable feeds and houses work horses used to pull tourist-filled carriages through the streets of a historic city. The stable owner wishes to strike a balance between a healthy nutritional...
A nervous kicker usually makes 70% of his first field goal attempts. If he makes his first attempt, his success rate rises to 90%. What is the probability that he makes his first two kicks?
A sample space S yields five equally likely events, A, B, C, D, and E. a. Find P(D) . b. Find P(Bc) . c. Find P(A C E) .
To test the belief that sons are taller than their fathers, a student randomly selects 13 fathers who have adult male children. She records the height of both he father and son in inches and obtains...
(a) By reading values from the given graph of f, use five rectangles to find a lower estimate and an upper estimate for the area under the given graph of f from x = 0 to x = 10. In each case sketch...
The Patricia Garcia Company is producing seven new medical products. Each of Garcia's eight plants can add one more product to its current line of medical devices. The unit manufacturing costs for...
The following table shows the mean annual percent return on capital (profitability) and the mean annual percentage sales growth for eight aerospace and defense companies. a. Compute the correlation...
A sample of patients arriving at Overbrook Hospitals emergency room recorded the following body temperature readings over the weekend: Construct and interpret a stem-and-leaf diagram. 100.4 99.6...
A group of Northeastern University researchers developed a new method for ranking the total driving performance of golfers on the Professional Golf Association (PGA) tour (The Sport Journal Winter...
The average family size was reported as 3.18. A random sample of families in a particular school district resulted in the following family sizes: At = 0.05, does the average family size differ from...
Consider the following network, where each number along a link represents the actual distance between the pair of nodes connected by that link. The objective is to find the shortest path from the...
For the Hawkins Company, the monthly percentages of all shipments that were received on time over the past 12 months are 80, 82, 84, 83, 83, 84, 85, 84, 82, 83, 84, and 83. a. Compare a three-month...
Linda Lechner is in charge of maintaining hospital supplies at General Hospital. During the past year, the mean lead time demand for bandage BX-5 was 60. Furthermore, the standard deviation for BX-5...
An investment broker has been given $250,000 to invest in a 12-month commitment. The money can be placed in Treasury notes (with a return of 8% and a risk score of 2) or in municipal bonds (with a...
A tank holds 1000 gallons of water, which drains from the bottom of the tank in half an hour. The values in the table show the volume V of water remaining in the tank (in gallons) after t minutes....
The Condé Nast Traveler Gold List for 2012 provided ratings for the top 20 small cruise ships (Condé Nast Traveler website, March 1, 2012). The data shown below are the...
Because many passengers who make reservations do not show up, airlines often overbook flights (sell more tickets than there are seats). A Boeing 767-400ER holds 245 passengers. If the airline...
Use multiple linear regression to derive a predictive equation for dissolved oxygen concentration as a function of temperature and chloride based on the data from Table P20.3. Use the equation to...
Recall the data on disk drives we saw in chapter 6 exercise 4. Suppose we want to predict Price from Capacity. a) Find the slope estimate, b1. b) What does it mean, in this context? c) Find the...
Using data from 1988 for houses sold in Andover, Massachusetts, from Kiel and McClain (1995), the following equation relates housing price (price) to the distance from a recently built garbage...
Trowbridge Manufacturing produces cases for personal computers and other electronic equipment. The quality control inspector for this company believes that a particular process is out of control....
A marketing professor at Givens College is interested in the relationship between hours spent studying and total points earned in a course. Data collected on 156 students who took the course last...
A federal study reported that 7.5% of the U.S. workforce has a drug problem. A drug enforcement official for the state of Indiana wished to investigate this statement. In her sample of 20 employed...
In an attempt to determine whether a relationship exists between the price of a home and the number of days it takes to sell the home, a real estate agent collects data on the recent sales of eight...
The divide and average methods, an old-time method for approximating the square root of any positive number ; can be formulated as x = x + a/x/2. Prove that this is equivalent to the Newton-Raphson...
A point P needs to be located somewhere on the line AD so that the total length L of cables linking P to the points A, B, and C is minimized (see the figure). Express L as a function of x = | AP |...
According to a Gallup Poll, about 17% of adult Americans bet on professional sports. Census data indicate that 48.4% of the adult population in the United States is male. (a) Assuming that betting is...
A local TV station conducted a "Pulse-Poll" about the upcoming mayoral election. Evening news viewers were invited to text in their votes, with the results to be announced on the late-night news....
The director of market research at a large department store chain wanted to conduct a survey throughout a metropolitan area to determine the amount of time working women spend shopping for clothing...
Brandon Lang is a creative entrepreneur who has developed a novelty soap item called Jackpot to target consumers with a gambling habit. Inside each bar of Jackpot shower soap is a single rolled-up...
Refer to the data in Solved Problem 13-1, which deals with Higgins Plumbing and Heating. Higgins has now collected 100 weeks of data and finds the following distribution for sales: Hot Water Number...
Use the data in SLEEP75.RAW for this exercise. The equation of interest is sleep = (0 + (1 totwrk + (2educ + (3 age + (4age2 + (5 yngkid + u. (i) Estimate this equation separately for men and women...
A road construction project would increase the road capacity around the outside roads from International Drive to Disney World by 200 cars per hour (Problem 11-19). The two paths affected would be...
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...
Suppose a 95% confidence interval for the mean salary of college graduates in a town in Mississippi is given by [$36,080, $43,920]. The population standard deviation used for the analysis is known to...
For unemployed persons in the United States, the average number of months of unemployment at the end of December 2009 was approximately seven months (Bureau of Labor Statistics, January 2010)....
Bath concentrations are measured hourly in a chemical process. Data (in ppm) for the last 32 hours are shown in Table 9E.4 (read down from left). The process target is µ0 = 175 ppm. (a)...
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...
A research council wants to estimate the mean length of time (in minutes) the average U.S. adult spends watching television using digital video recorders (DVRs) each day. To determine this estimate,...
The medal distribution from the 2008 Summer Olympic Games for the top 23 countries is shown below. Choose 1 medal winner at random. a. Find the probability that the winner won the gold medal, given...
To calculate a planets space coordinate, we have to solve the function f(x) = x 1 0.5 sin x Let the base point be = xi = /2 on the interval [0, ]. Determine the highest-order Taylor series...
Water exerts pressure on the upstream face of a dam as shown in Figure. The pressure can be characterized by p(z) = pg(D - z) Where p(z) = pressure in pascals (or N/m2) exerted at an elevation z...
A pediatrician wants to determine the relation that exists between a childs height, x, and head circumference, y. She randomly selects 11 children from her practice, measures their heights and head...
Do social recommendations increase ad effectiveness? A study of online video viewers compared viewers who arrived at an advertising video for a particular brand by following a social media...
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...
The resumes of 2 male applicants for a college teaching position in chemistry are placed in the same file as the resumes of 2 female applicants. Two positions become available and the first, at the...
CHB, Inc., is a bank holding company that is evaluating the potential for expanding into a 13-county region in the southwestern part of the state. State law permits establishing branches in any...
One cause of the downtime in Problem 3 was traced to a specific piece of computer hardware. Management believes that switching to a different hardware component will result in the following...
A patient receives a 150-mg injection of a drug every 4 hours. The graph shows the amount f(t) of the drug in the bloodstream after hours. (Later we will be able to compute the dosage and time...
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...
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...
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...
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...
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,...
An investor wants to select one of seven mutual funds for the coming year. Data showing the percentage annual return for each fund during five typical one-year periods are shown here. The assumption...
A study by Peter D. Hart Research Associates for the Nasdaq Stock Market revealed that 43% of all American adults are stockholders. In addition, the study determined that 75% of all American adult...
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....
What NCAA college basketball conferences have the higher probability of having a team play in college basketball's national championship game? Over the last 20 years, the Atlantic Coast Conference...
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...
Brand valuations are critical to CEOs, financial and marketing executives, security analysts, institutional investors, and others who depend on well researched, reliable information needed for...
Shorney Construction Company bids on projects assuming that the mean idle time per worker is 72 or fewer minutes per day. A sample of 30 construction workers will be used to test this assumption....
A political campaign is entering its final stage, and polls indicate a very close election. One of the candidates has enough funds left to purchase TV time for a total of five prime-time commercials...
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...
Is an MBA a golden ticket? Pursuing an MBA is a major personal investment. Tuition and expenses associated with business school programs are costly, but the high costs come with hopes of career...
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...
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...
The owner of a chain of three grocery stores has purchased five crates of fresh strawberries. The estimated probability distribution of potential sales of the strawberries before spoilage differs...
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....
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...
Describe briefly the steps used to develop a forecasting system.
The Laurenster Corporation has determined the client will pay them a $ 10,000 bonus if they complete the project in Problem 11-33 in 14 weeks or less. In Problem 11-33, The Laurenster Corporation...