In an attempt to assess total daily travel taxes in various cities, the Global Business Travel Association conducted a study of daily travel taxes on lodging, rental car, and meals (GBTA Foundation website, October 30, 2012). The data contained in the DATA file named Travel Tax are consistent with the findings of that study for business travel to Chicago. Assume the population standard deviation is known to be $8.50 and develop a$95\%$ confidence interval of the population mean total daily travel taxes for Chicago.

An experiment to study the relationship between x = time spent exercising (minutes) and y = amount of oxygen consumed during the exercise period resulted in the following summary statistics. a. Estimate the slope and y intercept of the population regression line. b. One sample observation on oxygen usage was 757 for a 2-minute exercise period. What amount of oxygen consumption would you predict for this exercise period, and what is the corresponding residual? c. Compute a $99\%$ confidence interval for the average change in oxygen consumption associated with a 1- minute increase in exercise time.

$$\begin{array}{l}{n=20 \sum x=50 \quad \sum y=16,705 \quad \sum x^{2}=150} \\ {\sum y^{2}=14,194,231 \quad \sum x y=44,194}\end{array}$$

A statistics instructor wonders whether significant differences exist in her students' median exam scores in her three different sections. She randomly selects scores from 10 different students in each section. A portion of the data is shown 7 in the accompanying table.

$$\begin{array}{|c|c|c|} \hline \text { Section 1 } & \text { Section 2 } & \text { Section 3 } \\ \hline 85 & 91 & 74 \\ \hline 68 & 84 & 69 \\ \hline \vdots & \vdots & \vdots \\ \hline 74 & 75 & 73 \\ \hline \end{array}$$

Do these data provide enough evidence at the $5 \%$ significance level to indicate that there are some differences in median scores in the three sections?

Read Eye on the Dreamliner and then answer the following questions:

• How many firms are involved in the production of the Dreamliner and how many are identified in the figure in the text?
• Is the Dreamliner a capital good or a consumption good? Explain why.
• State the factors of production that make the Dreamliner and provide an example of each.
• Explain how the production of the Dreamliner influences what, how, and for whom, goods and services are produced.
• Use a graph to show where in the circular flow model of the global economy the flows of the components listed earlier appear and where the sales of Dreamliners appear.

presents a partial balance sheet for Hargon, Inc., a creator and manufacturer of biotechnology pharmaceutical products, for December 31, 2012 and 2013.

$$\begin{array}{l} \textbf{Partial Balance Sheet for Hargon, Inc.}\\ \textbf{(all dollar amounts in millions)}\\ \textbf{(Problem 10.34)}\\ \end{array}$$

$$\begin{array}{lcc} &\textbf{December 31,}&\textbf{December 31,}\\ &\textbf{2013}&\textbf{2012}\\ \hline \text{Current Assets}&\underline{\ 11,712}&\underline{\$ 9,235}\\ \text{Land}&398&294\\ \text{Buildings and Improvements}&2,776&2,485\\ \text{Equipment}&4,243&3,584\\ \text{Construction in Progress}&\underline{1,271}&\underline{958}\\ \quad\text{Total Land, Buildings, and Equipment}&8,688&7,321\\ \text{Less Accumulated Depreciation}&\underline{((2,767))}&\underline{((2,283))}\\ \quad\text{Total Land, Buildings, and Equipment—Net}&\underline{35,921,014}&\underline{5,038}\\ \text{Intangibles Subject to Amortization:}&&\\ \quad\text{Developed Product Technology}&2,877&3,077\\ \quad\text{Core Technology}&1,348&1,348\\ \quad\text{Trade Name}&190&190\\ \quad\text{Acquired Technology Rights}&350&—\\ \quad\text{Other Intangible Assets}&\underline{454}&\underline{335}\\ \text{Total Intangibles Subject to Amortization}&5,219&4,950\\ \text{Less Accumulated Amortization}&&\\ \quad\text{Total Intangibles Subject to Amortization—Net}&\underline{3,747}&\underline{3,742}\\ \text{Goodwill}&\underline{11,302}&\underline{10,495}\\ \text{Other Assets}&\underline{1,06}&\underline{787}\\ \quad\text{Total Assets}&\underline{\$33,788}&\underline{\$29,287}\\ \hline \hline \end{array}$$

e. Hargon uses the straight-line amortization method and recognized $370 million of amortization for 2013 . Compute the average total life and average age of Hargon's intangibles subject to amortization for 2013.

Color and clarity of diamonds. Diamonds are categorized according to the "four C's": carats, clarity, color, and cut. Each diamond stone that is sold on the open market is provided a certificate by an independent diamond assessor that lists these characteristics. Data for 308 diamonds were extracted from Singapore's Business Times (Journal of Statistics Education, Vol. 9, No. 1, 2001). Color is classified as $\mathrm{D}, \mathrm{E}, \mathrm{F}, \mathrm{G}, \mathrm{H}$, or I, while clarity is classified as IF, VVS1, VVS2, VS1, or VS2. In addition to color and clarity, the independent certification group (GIA, HRD, or IGI), the number of carats and the asking price were recorded. Find and interpret the mode of the data set.

Products "Made in the USA." Refer to Exercise $2.154$ (p. 119) and the Journal of Global Business (Spring 2002) survey to determine what "Made in the USA" means to consumers. Recall that 106 shoppers at a shopping mall in Muncie, Indiana, responded to the question, "Made in the USA" means what percentage of U.S. labor and materials?" Sixty-four shoppers answered, "100%." Estimate the true proportion of consumers who believe "Made in the USA" means $100 \%$ U.S. Give a practical interpretation of the interval, part c.

Match the term with its definition.

$$\begin{matrix} \text{Definition} & \text{Term}\\ \text{A rise in Earth's average temperature} & \text{A. aquaculture}\\ \text{ } & \text{B. ozone layer}\\ \text{ } & \text{C. ecological footprint}\\ \text{ } & \text{D. monoculture}\\ \text{ } & \text{E. biological magnification}\\ \text{ } & \text{F. ecological hot spot}\\ \text{ } & \text{G. global warming}\\ \text{ } & \text{H. desertification}\\ \text{ } & \text{I. biodiversity}\\ \text{ } & \text{J. erosion}\\ \end{matrix}$$

On a random basis, Bob buys a small take-out coffee from one of two restaurants. As a statistics project in the month of May, he measured the temperature of each cup immediately after purchase, using an analog cooking thermometer. Assuming equal variances, is the mean temperature higher at Panera than at Bruegger's at $\alpha=.01$ ? Note: Ideal coffee temperature is a matter of individual preference (see www.coffeedetective.com). Coffee

$$\begin{array}{lllllllllllll}\text { Panera } & 171 & 161 & 169 & 179 & 171 & 166 & 169 & 178 & 171 & 165 & 172 & 172 \\ \text { Bruegger's } & 168 & 165 & 172 & 151 & 162 & 158 & 157 & 160 & 158 & 160 & 158 & 164\end{array}$$

The Pew Research Center asked a sample of adults if they had read a book in any format in the previous 12 months. The results are shown in the table.

a. If a person is randomly selected from this group, find the probability of the following:
i. the person is male
ii. the person has read a book in the previous 12 months
iii. the person is a male and has read a book in the previous 12 months.

b. Which group is more likely to have read a book in the previous 12 months: men or women? Support your answer with appropriate statistics.

Read a Book in the Previous 12 months

You work for a large global management consulting company. Of the entire workforce of analysts, $55 \%$ have had no experience in the telecommunications industry, $32 \%$ have had limited experience (less than 5 years), and the rest have had extensive experience (5 years or more). On a new project, you and two other analysts were selected at random to constitute a team. It turns out that part of the project involves telecommunications. What is the possibility that the first teammate you meet has:

b) Some telecommunications experience?

Modeling Data The table shows the numbers (in millions) of single women (never married) $s$ and married women $m$ in the civilian work force in the United States for the years $1997$ through $2005$. (Source: U.S. Bureau of Labor Statistics)

(a) Use the regression capabilities of a graphing utility to find a model of the form $m(s)=as^3+bs^2+cs+d$ for the data, where $t$ is the time in years, with $t=7$ corresponding to $1997$.

Suppose that you have been hired as a summer intern at a large amusement park. Every day, your task is to conduct $200$ exit interviews in the parking lot when customers leave. You need to construct questions to address the cleanliness of the park and the customers' intent to return. When you begin to construct a short questionnaire, you remember the control charts you learned in a statistics course, and you decide to write questions that wi ll provide you with data to graph on control charts. After collecting data for $30$ days, you plan to construct the control charts.

a. Write a question that will allow you to develop a control chart of customers' perceptions of cleanliness of the park.

Consider each of the following survey questions. For each one, explain any bias you find. If you think the question is unbiased (or fair), explain why. a. Do you agree that it is important to make ending homelessness a high priority? b. Which of the following factors is most important to address in order to slow global climate change? A. Car emissions B. Airplane emissions C. Pollutants from private industry D. Dependence on oil. c. How important is it to raise teacher salaries?