Stats Data And Models (Subscription) 3rd Edition Richard D De Veaux, Paul D Velleman, David E Bock - Solutions

Discover comprehensive solutions to "Stats Data And Models" 3rd Edition by Richard D De Veaux, Paul D Velleman, and David E Bock. Access answers key, detailed solutions pdf, and solved problems to enhance your understanding of statistical concepts. Our step-by-step answers and instructor manual provide clarity on complex questions and answers, while the online test bank and chapter solutions ensure thorough preparation. Utilize this textbook's solution manual for a deeper insight into each topic. Enjoy the convenience of free download options to access all resources, making learning both accessible and efficient.

Fuel economy Transport Canada and Natural Resources Canada track the fuel economy of automobiles. Among the data they collect are the manufacturer (Ford, Toyota, etc.); the vehicle type (car, SUV, etc.); and the weight, horsepower, and gas mileage (L/100 km) for city and highway driving.
Streams As research for an ecology class, students at Laurentian University collect data on streams each year. They record a number of biological, chemical, and physical variables, including the stream name, the substrate of the stream (limestone, shale, or mixed), the acidity of the water (pH),
Vineyards Business analysts hoping to provide information helpful to grape growers compiled the following data about vineyards: size (acres), number of years in existence, province, varieties of grapes grown, average case price, gross sales, and percent profit.
They found no evidence of the benefits of the compound.
Herbal medicine Scientists at a major pharmaceutical firm conducted an experiment to study the effectiveness of an herbal compound to treat the common cold. They exposed each patient to a cold virus, then gave them either the herbal compound or a sugar solution known to have no effect on colds.
Flowers In a study appearing in the journal Science, a research team reported that plants in southern England are flowering earlier in the spring. Records of the first flowering dates for 385 species over a period of 47 years show that flowering has advanced an average of 15 days per decade, an
Babies Medical researchers at a large city hospital investigating the impact of prenatal care on newborn health collected data from 882 births between 1998 and 2000. They kept track of the mother’s age, the number of weeks the pregnancy lasted, the type of birth (caesarean, induced, or natural),
Trudeaumania? Even before the 2015 federal election, early signs of Justin Trudeau’s appeal were becoming evident. An April 2013 Harris/Decima poll indicated that 57% of Canadians held a favourable view of new Liberal leader Justin Trudeau, while only 30% held an unfavourable impression. These
Tim Hortons doughnuts At the Tim Hortons Website (www.timhortons.com), there is a link called “Nutritional Information” that gives nutrition facts for various categories of food that it sells, such as doughnuts, sandwiches, etc. Under doughnuts, for example, we see a listing of all the
Schools The provincial or territorial ministry of education requires local school districts to keep the following records on all students: age, race or ethnicity, days absent, current grade level, standardized test scores in reading and mathematics, and any disabilities or special educational
Weighing bears Because of the difficulty of weighing a bear in the woods, researchers caught and measured 54 bears, recording their weight, neck size, length, and sex. They hoped to find a way to estimate weight from the other, more easily determined quantities.
Molten iron The Cleveland Casting Plant is a large, highly automated producer of grey and nodular iron automotive castings for Ford Motor Company. According to an article in Quarterly Engineering (7[1995]), Cleveland Casting is interested in keeping the pouring temperature of the molten iron (in
Honesty Coffee stations in offices often just ask users to leave money in a tray to pay for their coffee, but many people cheat. Researchers at Newcastle University alternately taped two posters over the coffee station. During one week, it was a picture of flowers; during the other, it was a pair
Stats students An online survey of students in a large Statistics class asked them to report their height, shoe size, sex, which degree program they were in, and their birth order (1 = only child or first born). The data were used for classroom illustrations.
Cars A survey of automobiles parked in student and staff lots at a large university recorded the make, country of origin, type of vehicle (car, van, SUV, etc.), and age.
Tracking sales A start-up company is building a database of customers and sales information. For each customer, it records name, ID number, region of the country (1 = East, 2 = Central, 3 = Prairies, 4 = West), date of last purchase, amount of purchase, and item purchased.
Air travel Transport Canada and the Canadian Transportation Agency monitor airlines for safety and customer service. For each flight, carriers must report the type of aircraft, the number of passengers, whether or not the flights departed and arrived on schedule, and any mechanical problems.
Biomass of trees Because of the difficulty of determining the biomass (or volume) of trees in the wild, Canadian forestry ecology researchers chose a sample of 25 trees in a BC forest, from each of three different species, then measured each tree’s diameter (at chest height), and estimated its
Investments Which mutual funds to choose? An investor with some RRSP funds to invest was considering investing in China or India funds. She went to www.globeinvestor.com, did a search, and found 48 China/India/ Chindia funds, where she viewed the one-month, oneyear, and five-year returns for
Blindness A study begun in 2011 examines the use of stem cells in treating two forms of blindness, Stargardt’s disease and dry age-related macular degeneration. Each of the 24 patients entered one of two separate trials, one for each form of blindness, in which embryonic stem cells were to be
Ovulation A study conducted by a team of American and Canadian researchers found that during ovulation, a woman can tell whether a man is gay or straight by looking at his face. To explore the subject, the authors conducted three investigations, the first of which involved 40 undergraduate women
The Internet Find an Internet source that reports on a study and describes the data. Print out the description and answer the questions above.
The news Find a newspaper or magazine article in which some data are reported. For the data discussed in the article, answer the questions above. Include a copy of the article with your report.
Stress A medical researcher measures the increase in heart rate of patients under a stress test. What kind of variable is the researcher studying?
Medicine A pharmaceutical company conducts an experiment in which a subject takes 100 mg of a substance orally. The researchers measure how many minutes it takes for half of the substance to exit the bloodstream. What kind of variable is the company studying?
Economic outlook An April 2016 Gallup Poll Canada asked Canadians, “What is your opinion about the local economy six months from now?” The possible responses were “Grows strong,” “Remains the same,” “Gets weaker,” and “Don’t know.” What kind of variable is the response?
Affairs A May 2015 Gallup Poll Canada question asked, “Please tell me whether you personally believe that in general it is morally acceptable, or morally wrong for married men and women having an affair?” The possible responses were “Morally acceptable,” “Morally wrong,” “Depends on
ZIP codes Unlike in Canada, the U.S. Postal Service uses five-digit ZIP codes to identify locations to assist in delivering mail.a) In what sense are ZIP codes categorical?b) Is there any ordinal sense to ZIP codes? In other words, does a larger ZIP code tell you anything about a location compared
Grade levels A person’s grade in school is generally identified by a number.a) Give an example of a why in which grade level is treated as categorical.b) Give an example of a why in which grade level is treated as quantitative.
Nobel laureates The web page at www.nobelprize.org/ nobel_prizes/peace/laureates/ allows you to look up all the Nobel prizes awarded in any year. The data are not listed in a table. Rather you drag a slider to a list of prize categories and then see a list of the awardees for each category for
Super Bowl Sports announcers love to quote statistics. During the Super Bowl, they particularly love to announce when a record has been broken. They might have a list of all Super Bowl games, along with the scores of each team, total scores for the two teams, margin of victory, passing yards for
Online shopping Online retailers such as Amazon.com keep data on products that customers buy, and even products they look at. What does Amazon hope to gain from such information?
Grocery shopping Many grocery store chains offer customers a card they can scan when they check out and offer discounts to people who do so. To get the card, customers must give information, including a mailing address and e-mail address. The actual purpose is not to reward loyal customers but to
Golf balls. The United States Golf Association (USGA)sets performance standards for golf balls. For example, the initial velocity of the ball may not exceed 250 feet per second when measured by an apparatus approved by the USGA. Suppose a manufacturer introduces a new kind of ball and provides a
Pizza. Aresearcher tests whether the mean cholesterol level among those who eat frozen pizza exceeds the value considered to indicate a health risk. She gets a P-value of 0.07. Explain in this context what the “7%” represents.
Hot dogs. Anutrition lab tested 40 hot dogs to see if their mean sodium content was less than the 325-mg upper limit set by regulations for “reduced sodium” franks. The lab failed to reject the hypothesis that the hot dogs did not meet this requirement, with a P-value of 0.142. A90%confidence
Salmon, second look. This chapter’s For Examples looked at mirex contamination in farmed salmon. We first found a 95% confidence interval for the mean concentration to be 0.0834 to 0.0992 parts per million.Later we rejected the null hypothesis that the mean did not exceed the EPA’s recommended
Arrivals 2009. Will your flight get you to your destination on time? The U.S. Bureau of Transportation Statistics reported the percentage of flights that were late each month from 1995 through March of 2009. Here’s a histogram, along with some summary statistics:We can consider these data to be a
Departures 2009. What are the chances your flight will leave on time? The U.S. Bureau of Transportation Statistics of the Department of Transportation publishes information about airline performance. Here are a histogram and summary statistics for the percentage of flights departing on time each
Better light. After his first attempt to determine the speed of light (described in Exercise 17), Michelson conducted an“improved” experiment. In 1897 he reported results of 100 trials with a mean of 852.4 and a standard deviation of 79.0.a) What is the standard error of the mean for these
Speed of light. In 1882 Michelson measured the speed of light (usually denoted c as in Einstein’s famous equation). His values are in km/sec and have 299,000 subtracted from them. He reported the results of 23 trials with a mean of 756.22 and a standard deviation of 107.12.a) Find a 95%
Parking II. Suppose that, for budget planning purposes, the city in Exercise 14 needs a better estimate of the mean daily income from parking fees.a) Someone suggests that the city use its data to create a 95% confidence interval instead of the 90% interval first created. How would this interval be
Dropouts. One study comparing various treatments for the eating disorder anorexia nervosa initially enlisted 198 subjects, but found overall that 105 failed to complete their assigned treatment programs. Construct and interpret an appropriate confidence interval. Discuss any reservations you have
NIMBY. In March 2007, the Gallup Poll split a sample of 1003 randomly selected U.S. adults into two groups at random. Half of the respondents were asked,“Overall, do you strongly favor, somewhat favor, somewhat oppose, or strongly oppose the use of nuclear energy as one of the ways to provide
Name recognition, part II. The advertising company described in Exercise 37 is thinking about signing a WNBAstar to an endorsement deal. In its poll, 27% of the respondents could identify her.a) Fans who never took Statistics can’t understand why the company did not offer this WNBA player an
Name recognition. An advertising agency won’t sign an athlete to do product endorsements unless it is sure the person is known to more than 25% of its target audience.The agency always conducts a poll of 500 people to investigate the athlete’s name recognition before offering a contract. Then
Grade inflation. In 1996, 20% of the students at a major university had an overall grade point average of 3.5 or higher (on a scale of 4.0). In 2000, a random sample of 1100 student records found that 25% had a GPA of 3.5 or higher. Is this evidence of grade inflation?
Approval 2007. Of all the post–World War II presidents, Richard Nixon had the highest disapproval rating near the end of his presidency. His disapproval rating peaked at 66% in July 1974, just before he resigned. In May 2007, George W. Bush’s disapproval rating was 63%, according to a Gallup
Power. We are replicating an experiment. How will each of the following changes affect the power of our test?Indicate whether it will increase, decrease, or remain the same, assuming that all other aspects of the situation remain unchanged.a) We increase the number of subjects from 40 to 100.b) We
Fried PCs. A computer company recently experienced a disastrous fire that ruined some of its inventory.Unfortunately, during the panic of the fire, some of the damaged computers were sent to another warehouse, where they were mixed with undamaged computers.The engineer responsible for quality
Safety. Observers in Texas watched children at play in eight communities. Of the 814 children seen biking, roller skating, or skateboarding, only 14% wore a helmet.a) Create and interpret a 95% confidence interval.b) What concerns do you have about this study that might make your confidence
Preemies. Among 242 Cleveland-area children born prematurely at low birth weights between 1977 and 1979, only 74% graduated from high school. Among a comparison group of 233 children of normal birth weight, 83%were high school graduates. (“Outcomes in Young Adulthood for Very-Low-Birth-Weight
Errors. An auto parts company advertises that its special oil additive will make the engine “run smoother, cleaner, longer, with fewer repairs.” An independent laboratory decides to test part of this claim. It arranges to use a taxicab company’s fleet of cars. The cars are randomly divided
Alcohol abuse. Growing concern about binge drinking among college students has prompted one large state university to conduct a survey to assess the size of the problem on its campus. The university plans to randomly select students and ask how many have been drunk during the past week. If the
Teen smoking 2006. The Centers for Disease Control and Prevention say that about 23% of teenagers smoke tobacco (down from a high of 38% in 1997). A college has 522 students in its freshman class. Is it likely that more than 30% of them are smokers? Explain.
Crohn’s disease. In 2002 the medical journal The Lancet reported that 335 of 573 patients suffering from Crohn’s disease responded positively to injections of the arthritisfighting drug infliximab.a) Create a 95% confidence interval for the effectiveness of this drug.b) Interpret your interval
Cigarettes 2006. In 1999 the Centers for Disease Control and Prevention estimated that about 34.8% of high school students smoked cigarettes. They established a national health goal of reducing that figure to 16% by the year 2010. To that end, they hoped to achieve a reduction to 20% by 2006. In
Language. Neurological research has shown that in about 80% of people language abilities reside in the brain’s left side. Another 10% display right-brain language centers, and the remaining 10% have two-sided language control. (The latter two groups are mainly lefthanders.)(Science News, 161, no.
Cheating. A Rutgers University study released in 2002 found that many high school students cheat on tests.The researchers surveyed a random sample of 4500 high school students nationwide; 74% of them said they had cheated at least once.a) Create a 90% confidence interval for the level of cheating
Largemouth bass. Organizers of a fishing tournament believe that the lake holds a sizable population of largemouth bass. They assume that the weights of these fish have a model that is skewed to the right with a mean of 3.5 pounds and a standard deviation of 2.2 pounds.a) Explain why a skewed model
Perfect pitch. A recent study of perfect pitch tested students in American music conservatories. It found that 7% of 1700 non-Asian and 32% of 1000 Asian students have perfect pitch. A test of the difference in proportions resulted in a P-value ofa) What are the researchers’ null and alternative
In May 2002, the National Highway Traffic Safety Administration reported that even though only 6.8% of licensed drivers are between 15 and 20 years old, they were involved in 14.3% of all fatal crashes. Insurance companies have long known that teenage boys were high risks, but what about teenage
Teen deaths. Traffic accidents are the leading cause of death among people aged 15 to
Enough eggs? One of the important issues for poultry farmers is the production rate—the percentage of days on which a given hen actually lays an egg. Ideally, that would be 100% (an egg every day), but realistically, hens tend to lay eggs on about 3 of every 4 days. ISA Babcock wants to advertise
Polling disclaimer. A newspaper article that reported the results of an election poll included the following explanation:The Associated Press poll on the 2000 presidential campaign is based on telephone interviews with 798 randomly selected registered voters from all states except Alaska and
Eggs. The ISA Babcock Company supplies poultry farmers with hens, advertising that a mature B300 Layer produces eggs with a mean weight of 60.7 grams.Suppose that egg weights follow a Normal model with standard deviation 3.1 grams.a) What fraction of the eggs produced by these hens weigh more than
Is there any evidence that when eclampsia does occur, the magnesium sulfate treatment may help prevent the woman’s death?a) Write an appropriate hypothesis.b) Check the assumptions and conditions.c) Find the P-value of the test.d) What do you conclude about the magnesium sulfate treatment?e) If
Eclampsia. Refer again to the research summarized in Exercise
Eclampsia. It’s estimated that 50,000 pregnant women worldwide die each year of eclampsia, a condition involving elevated blood pressure and seizures. Aresearch team from 175 hospitals in 33 countries investigated the effectiveness of magnesium sulfate in preventing the occurrence of eclampsia in
Twins. There is some indication in medical literature that doctors may have become more aggressive in inducing labor or doing preterm cesarean sections when a woman is carrying twins. Records at a large hospital show that, of the 43 sets of twins born in 1990, 20 were delivered before the 37th week
Free throws 2007. During the 2006–2007 NBA season, Kyle Korver led the league by making 191 of 209 free throws, for a success rate of 91.39%. But Matt Carroll was close behind, with 188 of 208 (90.39%).a) Find a 95% confidence interval for the difference in their free throw percentages.b) Based
Archery. A champion archer can generally hit the bull’seye 80% of the time. Suppose she shoots 200 arrows during competition. Let represent the percentage of bull’s-eyes she gets (the sample proportion).a) What are the mean and standard deviation of the sampling distribution model for ?b) Is a
Vitamin D. In July 2002 the American Journal of Clinical Nutrition reported that 42% of 1546 African-American women studied had vitamin D deficiency. The data came from a national nutrition study conducted by the Centers for Disease Control and Prevention in Atlanta.a) Do these data meet the
Bimodal. We are sampling randomly from a distribution known to be bimodal.a) As our sample size increases, what’s the expected shape of the sample’s distribution?b) What’s the expected value of our sample’s mean?Does the size of the sample matter?c) How is the variability of sample means
Death penalty 2006. In May of 2006, the Gallup Organization asked a random sample of 537 American adults this question:If you could choose between the following two approaches, which do you think is the better penalty for murder, the;10%.death penalty or life imprisonment, with absolutely no
Net-Newsers In June of 2008, the Pew Research Foundation sampled 3615 U.S. adults and asked about their choice of news sources. They identified 13% as “Net-Newsers”who regularly get their news from online sources rather than TV or newspapers.a) Pew reports a margin of error of ±2% for this
Dice. When one die is rolled, the number of spots showing has a mean of 3.5 and a standard deviation of 1.7. Suppose you roll 10 dice. What’s the approximate probability that your total is between 30 and 40 (that is, the average for the 10 dice is between 3 and 4)? Specify the model you use and
Scrabble. Using a computer to play many simulated games of Scrabble, researcher Charles Robinove found that the letter “A” occurred in 54% of the hands. This study had a margin of error of (Chance, 15, no. 1 [2002])a) Explain what the margin of error means in this context.b) Why might the
Surgery and germs. Joseph Lister (for whom Listerine is named!) was a British physician who was interested in the role of bacteria in human infections. He suspected that germs were involved in transmitting infection, so he tried using carbolic acid as an operating room disinfectant. In 75
Leaky gas tanks. Nationwide, it is estimated that 40% of service stations have gas tanks that leak to some extent.A new program in California is designed to lessen the prevalence of these leaks. We want to assess the effectiveness of the program by seeing if the percentage of service stations whose
Polling 2004. In the 2004 U.S. presidential election, the official results showed that George W. Bush received 50.7% of the vote and John Kerry received 48.3%. Ralph Nader, running as a third-party candidate, picked up only 0.4%. After the election, there was much discussion about exit polls, which
Birth days. During a 2-month period in 2002, 72 babies were born at the Tompkins Community Hospital in upstate New York. The table shows how many babies were born on each day of the week.a) If births are uniformly distributed across all days of the week, how many would you expect on each day?b)
Color-blind. Medical literature says that about 8% of males are color-blind. Auniversity’s introductory psychology course is taught in a large lecture hall. Among the students, there are 325 males. Each semester when the professor discusses visual perception, he shows the class a test for color
Herbal cancer. A report in the New England Journal of Medicine (June 6, 2000) notes growing evidence that the herb Aristolochia fangchi can cause urinary tract cancer in those who take it. Suppose you are asked to design an experiment to study this claim. Imagine that you have data on urinary tract
Computer gaming. Who plays online or electronic games? A survey in 2006 found that 69% of 223 boys aged 12–14 said they “played computer or console games like Xbox or PlayStation . . . or games online.” Of 248 boys aged 15–17, only 62% played these games. Is this evidence of a real
Online activity checks. Are more parents checking up on their teen’s online activities? A Pew survey in 2004 found that 33% of 868 randomly sampled teens said that their parents checked to see what websites they visited.In 2006 the same question posed to 811 teens found 41%reporting such checks.
Retention rates. In 2004 the testing company ACT, Inc., reported on the percentage of first-year students at four-year colleges who return for a second year. Their sample of 1139 students in private colleges showed a 74.9% retention rate, while the rate was 71.9% for the sample of 505 students at
Sensitive men. In August 2004, Time magazine, reporting on a survey of men’s attitudes, noted that “Young men are more comfortable than older men talking about their problems.” The survey reported that 80 of 129 surveyed 18- to 24-year-old men and 98 of 184 25- to 34-year-old men said they
Gender gap. Candidates for political office realize that different levels of support among men and women may be a crucial factor in determining the outcome of an election. One candidate finds that 52% of 473 men polled say they will vote for him, but only 45% of the 522 women in the poll express
Pain. Researchers comparing the effectiveness of two pain medications randomly selected a group of patients who had been complaining of a certain kind of joint pain.They randomly divided these people into two groups, then administered the pain killers. Of the 112 people in the group who received
Mammograms. A 9-year study in Sweden compared 21,088 women who had mammograms with 21,195 who did not. Of the women who underwent screening, 63 died of breast cancer, compared to 66 deaths among the control group. (The New York Times, Dec 9, 2001)a) Do these results support the effectiveness of
Twins. In 2001, one county reported that, among 3132 white women who had babies, 94 were multiple births.There were also 20 multiple births to 606 black women.Does this indicate any racial difference in the likelihood of multiple births?a) Test an appropriate hypothesis and state your conclusion in
Shopping. A survey of 430 randomly chosen adults found that 21% of the 222 men and 18% of the 208 women had purchased books online.a) Is there evidence that men are more likely than women to make online purchases of books? Test an appropriate hypothesis and state your conclusion in context.b) If
Politics and sex. One month before the election, a poll of 630 randomly selected voters showed 54% planning to vote for a certain candidate. A week later it became known that he had had an extramarital affair, and a new poll showed only 51% of 1010 voters supporting him.Do these results indicate a
Birth weight. In 2003 the Journal of the American Medical Association reported a study examining the possible impact of air pollution caused by the 9/11 attack on New York’s World Trade Center on the weight of babies.Researchers found that 8% of 182 babies born to mothers who were exposed to
Pregnancy. In 1998, a San Diego reproductive clinic reported 42 live births to 157 women under the age of 38, but only 7 live births for 89 clients aged 38 and older.Is this strong evidence of a difference in the effectiveness of the clinic’s methods for older women?a) Was this an experiment?
Depression, revisited. Consider again the study of the association between depression and cardiac disease survivability in Exercise 18.a) Create a 95% confidence interval for the difference in survival rates.b) Interpret your interval in this context.c) Carefully explain what “95% confidence”
Teen smoking, part II. Consider again the Vermont study discussed in Exercise 17.a) Create a 95% confidence interval for the difference in the proportion of children who may smoke and have approving parents and those who may smoke and have disapproving parents.b) Interpret your interval in this
Depression. A study published in the Archives of General Psychiatry in March 2001 examined the impact of depression on a patient’s ability to survive cardiac disease. Researchers identified 450 people with cardiac disease, evaluated them for depression, and followed the group for 4 years. Of the
Teen smoking, part I. A Vermont study published in December 2001 by the American Academy of Pediatrics examined parental influence on teenagers’ decisions to smoke. A group of students who had never smoked were questioned about their parents’ attitudes toward smoking.These students were

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Stats Data And Models (Subscription) 3rd Edition Richard D De Veaux, Paul D Velleman, David E Bock - Solutions

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