Question: Consider CREF, the College Retirement Equities

> Consider the percentage change in the value of the dollar with respect to Asia-Pacific currencies, year-to-date as of mid-October 2015 (Table 4.3.9). a. Find the average percentage change in the value of the dollar, averaging over all of these countries.

> Consider the monthly sales of 17selectedsalesrepresentatives (in thousands of dollars): 23, 14, 26, 22, 28, 21, 34, 25, 32, 32, 24, 34, 22, 25, 22, 17, 20 a. Find the average and median. b. Draw the box plot.

> Consider the prediction of annual salary from age and experience. a. Find and interpret the regression equation and regression coefficients. b. Find and interpret the standard error of estimate. c. Find and interpret the coefficient of determination. d.

> Consider the following list of your products’ share of 20 major metropolitan areas: 0.7%, 20.8%, 2.3%, 7.7%, 5.6%, 4.2%, 0.8%, 8.4%, 5.2%, 17.2%, 2.7%, 1.4%, 1.7%, 26.7%, 4.6%, 15.6%, 2.8%, 21.6%, 13.3%, 0.5% a. Find the average and the median. b. Draw a

> Consider the strength of cotton yarn used in a weaving factory, in pounds of force at breakage, measured from a sample of yarn from the supplies room: 117, 135, 94, 79, 90, 85, 173, 102, 78, 85, 100, 205, 93, 93, 177, 148, 107 a. Find the average breakin

> Consider the loan fees charged for granting home mortgages, as shown in Table 4.3.8, for Dallas TX, 30-year fixed rate for home purchase, with credit Score 740+, and with 20% down payment. These are given as a percentage of the loan amount and are one-ti

> Table 4.3.7 shows percent increases from the offer price of initial public stock offerings, as most of these newly traded companies increased in value, whereas some of them lost money. a. Draw a cumulative distribution function for this dataset. b. Find

> Consider the revenues (in $ millions) for the top 12 companies in the Fortune 500 (from http://fortune.com/ fortune500/ accessed October 20, 2015.), as shown in Table 4.3.6. a. Find the five-number summary. b. Draw a box plot. Table 4.3.6: TABLE 4.

> Consider the percent change in housing values over a five-year period for regions of the United States, as shown in Table 4.3.5. a. Find the mean and median percent change in housing values. b. Find the five-number summary for this data set. c. Draw a bo

> You have begun a quality improvement campaign in your paper mill, and, as a result, lots of pieces of paper come to your desk. Each one describes a recent problem with customers according to the following codes: A = paper unavailable, B = paper too thick

> Consider the 20,000 people in the donations database (on the companion site). a. Construct box plots to compare median household income and per capita income (these specify two columns in the database) by putting the two box plots on the same scale. b. D

> Using the data from Table 2.6.8 of Chapter 2 for daily values for the Dow Jones Industrial Average: a. Find the mean net change. b. Find the median net change. c. Find the five-number summary for net change. d. Draw a box plot for net change. e. Find the

> Using the data from Table 2.6.7 of Chapter 2 for the 30 Dow Jones Industrial companies percent changes since January 2015: a. Find the mean percent change. b. Find the median percent change. c. Find the five-number summary for percent change. d. Draw the

> Consider predicting annual salary from age, experience, and an interaction term. a. Create a new variable, “interaction,” by multiplying age by experience for each employee. b. Find the regression equation to predict annual salary from age, experience, a

> Many marketers assumed that consumers would go for reduced-calorie foods in a big way. While these “light” foods caught on to some extent, they hadn’t yet sold in the large quantities their producers

> Use the data set from problem 21 of Chapter 3 on poor quality in the production of electric motors. a. Find the average and median to summarize the typical level of problems with quality of production. b. Remove the two outliers, and re compute the avera

> Consider the 20,000 median household income values in the donations database (available on the companion site). These represent the median household income for the neighborhood of each potential donor in the database. a. Construct a cumulative distributi

> Consider the data on CEO compensation in computer programming, data processing, and other related services firms from Table 3.8.7 of Chapter 3. a. Draw a detailed box plot. b. Find the 10th percentile of compensation. Table 3.8.7: TABLE 3.8.7 CEOo

> Consider the costs charged for treatment of heart failure and shock by hospitals in the Puget Sound area, using the data from Table 3.8.6 of Chapter 3. a. Summarize the costs. b. Draw a box plot. c. Draw a cumulative distribution function. d. If your hos

> Recall in the example on CEO compensation by prepackaged software companies from Chapter 3 that we identified an outlier (Lawrence J. Ellison of Oracle Corp, with compensation of $56.81 million). a. Draw a detailed box plot for this dataset. How many out

> Consider the following list of your product’s market share of 20 major metropolitan areas: 0.7%, 20.8%, 2.3%, 7.7%, 5.6%, 4.2%, 0.8%, 8.4%, 5.2%, 17.2%, 2.7%, 1.4%, 1.7%, 26.7%, 4.6%, 15.6%, 2.8%, 21.6%, 13.3%, 0.5%. a. Construct an appropriate histogram

> Consider the 20,000 median household income values in the donations database (available at the companion site). These represent the median household income for the neighborhood of each potential donor in the database. a. Construct a histogram. b. Describ

> Using the data from Table 2.8 of Chapter 2 for daily values for the Dow Jones Industrial Average: a. Construct a histogram for net change during September 2015. b. Describe the shape of the distribution. c. Construct a histogram for percent change during

> Using the data from Table 2.7 of Chapter 2 for the 30 Dow Jones Industrial companies: a. Construct a histogram for percent change since January 2015. b. Describe the shape of the distribution. Table 2.7: TABLE 2.6.7 Closing Price and Year-to-Date P

> Now examine the effect of training level on annual salary, with and without adjusting for age and experience. a. Find the average annual salary for each of the three training levels and compare them. b. Find the multiple regression equation to predict an

> Consider the following list of prices (in dollars) charged by different pharmacies for 12 60-mg tablets of the prescription drug Tylenol No. 4 with codeine: 17 6.75, 12.19, 9.09, 9.09, 13.09, 13.45, 7.89, 12.00, 10.49, 15.30, 13.29. a. Construct a histog

> Consider the percentage change in the value of the dollar with respect to Asia-Pacific currencies over approximately three quarters from start of 2015 through mid October (Table 3.8.13). a. Construct an appropriate histogram of this data set. b. Describe

> As part of your firm’s loyalty system, there is a database with information about customers who have joined, including the size of their immediate family, the number of cars they own, and their income. a. Based only on this information, does this databas

> Draw a histogram for the following list of prices charged by different stores for a box of envelopes (in dollars) and describe the distribution shape: 4.40, 4.20, 4.55, 4.45, 4.40, 4.10, 4.10, 3.80, 3.80, 4.30, 4.90, 4.20, 4.05.

> Consider the order size of recent customers (in thousands of dollars): 31, 14, 10, 3, 17, 5, 1, 17, 1, 2, 7, 12, 28, 4, 4, 10, 4, 3, 9, 28, 4, 3. a. Construct a histogram for this data set. b. Describe the distribution shape.

> Consider the salaries (in thousands of dollars) of a group of business executives: 177, 54, 98, 57, 209, 56, 45, 98, 58, 90, 116, 42, 142, 152, 85, 53, 52, 85, 72, 45, 168, 47, 93, 49, 79, 145, 149, 60, 58 a. Construct a histogram of this data set. b. De

> Draw a histogram of the market values of your main competitors (in millions of dollars) and describe the distribution shape: 3.7, 28.3, 10.6, 0.1, 9.8, 6.2, 19.7, 23.8, 17.8, 7.8, 10.8, 10.9, 5.1, 4.1, 2.0, 24.2, 9.0, 3.1, 1.6, 3.7, 27.0, 1.2, 45.1, 20.4

> Draw a histogram of interest rates offered by banks on certificates of deposit and describe the distribution shape: 9.9%, 9.5%, 10.3%, 9.3%, 10.4%, 10.7%, 9.1%, 10.0%, 8.8%, 9.7%, 9.9%, 10.3%, 9.8%, 9.1%, 9.8%

> Consider the price of renting a car for a week, with manual transmission but declining the collision damage waiver, in 13 European countries (Table 3.8.12). a. Draw a histogram of this data set. b. Describe the distribution shape. Table 3.8.12: TAB

> The number of small electric motors rejected for poor quality, per batch of 250, were recorded for recent batches. The results were as follows: 3, 2, 7, 5, 1, 3, 1, 7, 0, 6, 2, 3, 4, 1, 2, 25, 2, 4, 5, 0, 5, 3, 5, 3, 1, 2, 3, 1, 3, 0, 1, 6, 3, 5, 41, 1,

> What action would you recommend? Why?

> Should we agree with Billings at the next meeting? Justify your answer by careful analysis of the available data.

> Continuing with the revenue loss data of Table 3.8.11: a. Find the logarithm for each data value. Omit the two firms with zero revenue loss from your answers to this problem. b. Construct a histogram for this data set. c. Describe the distribution shape.

> When the Internal Revenue Service (IRS) tax code was revised in 1986, Congress granted some special exemptions to specific corporations. The U.S. government’s revenue losses due to some of these special transition rules for corporate pr

> Many people do not realize how much a funeral costs and how much these costs can vary from one provider to another. Consider the price of a traditional funeral service with visitation (excluding casket and grave liner) as shown in Table 3.8.10 for the Pu

> Consider the net income as reported by selected firms in Table 3.8.9. a. Construct a histogram. b. Describe the distribution shape. Table 3.8.9: TABLE 3.8.9 Net Income of Selected Firms Firm Net Income ($ Thousands) Bay State Bancorp 1,423 Bedford

> There are many different and varied formats and strategies for radio stations, but one thing they all have in common is the need for an audience in order to attract advertisers. Table 3.8.8 shows the percent of listeners for radio stations in the Albuque

> Consider the compensation paid to CEOs of computer programming, data processing, and other related services firms, as shown in Table 3.8.7. a. Construct a histogram. b. Describe the distribution shape. Table 3.8.7: TABLE 3.8.7 CEOo Compensation for

> Consider the costs charged for treatment of heart failure and shock by hospitals in the Puget Sound area, as shown in Table 3.8.6. a. Construct a histogram. b. Describe the distribution shape. Table 3.8.6: TABLE 3.8.6 Hospital Charges for Heart Fa

> Draw a histogram of the average hospital charge in ($ thousands) for treating a patient who had the diagnosis group “Inguinal & femoral hernia procedures w MCC” for a group of hospitals in Washington State (data accessed at http://wwwdoh.wa.gov/EHSPHL/h

> Consider the percent change in revenues for food-related companies in the Fortune 500, in Table 3.8.5. a. Construct a histogram for this data set. b. Describe the distribution shape. c. Land O’Lakes had the largest decrease, falling by

> Table 2.6.1 shows some items from a human resources database, representing the status of five people on May 3, 2015. a. What is an elementary unit for this data set? b. What kind of data set is this: Univariate, bivariate, or multivariate? c. Which of th

> Look through the data. Do you find anything that calls into question the regression results? Perform further analysis as needed.

> Consider the 20,000 median household income values in the donations database (available at the companion site). These represent the median household income for the neighborhood of each potential donor in the database. a. Construct a histogram. b. Describ

> Consider the percentage change in stock price of the most active issues traded on the NASDAQ stock exchange, as shown in Table 3.8.3. a. Construct a histogram of this data set. b. Describe the distribution shape. c. Identify the outlier. d. Interpret the

> Business firms occasionally buy back their own stock for various reasons, sometimes when they view the market price as a bargain compared to their view of its true worth. It has been observed that the market price of stock often increases around the time

> Consider the yields (as an interest rate, in percent per year) of municipal bonds, as shown in Table 3.8.1. a. Construct a histogram of this data set. b. Based on the histogram, what values appear to be typical for this group of tax-exempt bonds? c. Desc

> Many countries (but not the United States) have a “value added tax” that is paid by businesses based on how much value they add to a product (e.g. the difference between sales revenues and the cost of materials). This

> Mutual funds that specialize in the stock of natural resources companies showed considerable variation in their performance during the 12-month period ending July 2010. Consider the Rate of Return column in Table 5.5.3. a. Find the average rate of return

> Consider the Internet advertising budgets from problem 1, but expressed in European euros instead of U.S. dollars. Use the exchange rate listed in a recent issue of The Wall Street Journal or another source. Based on your answers to problem 1 (ie, withou

> Table 4.3.1 provides a list of the amounts that your regular customers spent on your products last month: a. Find the average sales per regular customer. b. Find the median and quartiles. c. Draw the box plot. d. Find the outliers, if any. e. Draw the de

> Refer to the data for problem 6. a. Find the critical value from the F table at the 10% level and report the result of the F test at this level. b. Summarize what this F test has told you about the comparative abilities of these additives to reduce waste

> What are the “obvious conclusions” from the hypothesis tests in the regression output?

> Refer to the data for problem 6. Would it be appropriate to use the least-significant-difference test to find out whether Cleen Up has significantly lower waste than Sludge Away (at the 5% level)? Why or why not? Data from problem 6: Three companies ar

> Refer to the data for problem 6. a. Find the F statistic and its numbers of degrees of freedom. b. Interpret the F statistic in terms of how many times more volatile one source of variability is than another. c. Find the critical value from the F table a

> Three companies are trying to sell you their additives to reduce waste in a chemical manufacturing process. You are not sure their products are appropriate because your process is different from the industry standard (it is a proprietary trade secret). Y

> Refer to the data for problem 1. a. Find the average difference and its standard error for every pair of advertisements (computed as ad 2minus ad 1, ad 1minus ad3, and ad 2minusad 3). b. Test every pair of advertisements atthe1%level and report the resul

> Refer to the data for problem 1. a. Find the average difference between the effectiveness of ad 1 and that of ad 2 (computed as ad 2 minus ad 1). b.* Find the standard error for this average difference. c. How many degrees of freedom does this standard e

> Refer to the data for problem 1. a. Find the critical value from the F table at the 0.1% level and report the result of the F test at this level. b. Summarize what this test has told you about any differences among these ads for consumers in general in t

> Another experiment in the report by Meyers-Levy and Peracchio involved the evaluation of bicycle pictures taken with various camera angles, as evaluated by two groups of individuals with different levels of motivation. (The high-motivation group believed

> Camera angle can make a difference in advertising; it can even affect the viewer’s evaluation of a product. A research article reported a main effect for camera angle (F2,29 = 14.48, p

> Are prices really higher in department stores as compared to off-price stores? Kirby and Dardis examined prices of 20 items (shirts, pants, etc.) for 13 weeks and found that prices are indeed 40% higher in department stores.12 The ANOVA table, adapted fr

> Refer to the data for problem 1. a. Find the F statistic and its numbers of degrees of freedom. b. Interpret the F statistic in terms of how many times more volatile one source of variability is than another. c. Find the critical value from the F table a

> What would you recommend? Are there any other considerations that might change your mind?

> Which is better: competition or cooperation? And does the answer depend on whether the participants share the same values? A study by Cosier and Dalton sheds light on these issues.11 One of their ANOVA tables provides the basis for Table 15.5.5. a.* The

> Is there a significant interaction between supplier and shift in Table 15.5.4? Justify and interpret your answer. Table 15.5.4: TABLE 15.5.4 Average Quality Scores and ANOVA Table Day Shift Night Shift Swing Shift Average Supplier A 77.06 93.12 77.

> Compare the overall average for the day shift to that for the night and swing shifts (refer to Table 15.5.4). Does it appear that there are large differences (more than two or three quality points) among shifts? Are these differences significant? How do

> Use multiple regression with indicator variables, instead of one-way ANOVA, to test whether the quality data in show significant differences from one supplier to another. (You may wish to review the material on indicator variables from Chapter 12.) a. Cr

> Refer to the data for problem 11. Continue using the logarithms of the lengths of calls. a. Find the average difference and its standard error for every pair of types of calls (subtracting smaller from larger in each case). b. Which pairs of types of cal

> Refer to the data for problem 11. Continue using the logarithms of the lengths of calls. a. Find the F statistic and its numbers of degrees of freedom. b. Find the critical value from the F table at the 5% level. c. Report the result of the F test at the

> In an attempt to regain control of your time, you have been recording the time required, in minutes, to respond to each telephone call for the day. Before you make changes (such as referring certain types of calls to subordinates), you would like to have

> Refer to the data for problem 6. Select the two additives with the largest average difference in waste and answer the following. (Use the least-significant difference test method for this problem, subtracting smaller from larger even if you feel that it

> Three advertisements have been tested, each one using a different random sample of consumers from the same city. Scores indicating the effectiveness of the advertisement were analyzed; the results are shown in Table 15.5.1. a. Which advertisement appears

> Table 14.4.3 shows the quarterly net sales of Mattel, a major designer, manufacturer, and marketer of toys. Because of seasonal gift giving, you might expect fourth-quarter sales to be much higher, generally, than those of the other three quarters of the

> Does the amount of purifier have a significant effect on yield, according to this regression analysis? Based on this alone, would you be likely to recommend including a purifying step in the production process?

> Consider Intel’s Net Revenue in Table 14.4.2. a. Construct a time-series plot for this data set. Describe the seasonal and cyclic behavior that you see, as well as any evidence of irregular behavior. b. Which quarter(1,2,3, or4) appears

> Consider the Walt Disney Company’s quarterly revenues as shown in Table 14.4.1. a. Draw a time-series plot for this data set. Describe any trend and seasonal behavior that you see. b. Find the moving average values and plot them on the

> At a meeting, everyone seems to be pleased by the fact that sales increased from $21,791,000 to $22,675,000 from the third to the fourth quarter. Given that the seasonal indices are 1.061 for quarter 3 and 1.180 for quarter 4, write a paragraph analyzing

> The number of job openings fluctuates through time, providing useful information about the current state of the economy and possibilities for the future. Table 14.4.11 shows the computer results of a Box Jenkins analysis of job openings in thousands, ann

> Tables 14.4.9 and 14.4.10 show basic computer results from a Box-Jenkins analysis of yields on 3-month U.S. Treasury bills each year from 1970 through 2009. a. What kind of process has been fitted? b. Write the model in a way that shows how the next obse

> Gross Domestic Product (GDP) is an important measure of total production and is used by business to help guide their planning for the future. Table 14.4.8 shows a Box Jenkins analysis of the percentage change in GDP (from the same quarter of the previous

> Table 14.4.7 shows basic computer results from a Box Jenkins analysis of the daily percentage changes in the Dow Jones Industrial stock market index from Jul. 31 to Oct. 9, 1987, prior to the crash of 1987. a. What kind of process has been estimated? b.

> For each of the following, tell whether it is likely to be stationary or non stationary and why. a. The price per share of Google stock, recorded daily. b. The prime rate, recorded weekly. This is the interest rate that banks charge their best customers

> Consider the time series of quarterly sales in thousands shown in Table 14.4.6. The seasonal indices are 0.89 for quarter 1, 0.88 for 2, 1.27 for 3, and 0.93 for 4. a. Find the seasonally adjusted sales corresponding to each sales value. b. In which quar

> The number of diners per quarter eating at your apre `s-ski restaurant has been examined using trend-seasonal analysis. The quarterly seasonal indexes are 1.45, 0.55, 0.72, and 1.26 for quarters 1, 2, 3, and 4, respectively. A linear trend has been estim

> What is your interpretation of the effectiveness of the ads in this study? What would you recommend in this situation?

> Based on past data, your firm’s sales show a seasonal pattern. The seasonal index for November is 1.08, for December it is 1.38, and for January it is 0.84. Sales for November were $285,167. a. Would you ordinarily expect an increase in sales from Novemb

> Consider PepsiCo’s quarterly net revenue as shown in Table 14.4.5. a. Draw a time-series plot for this data set. Describe any trend and seasonal behavior that you see. b. Plot the moving average values on the same graph as the original

> Amazon.com is an e-commerce firm that has shown considerable growth since its founding in 1995, and its quarterly net sales are shown in Table 14.4.4. Their 2014 annual report includes a section titled “Seasonality” th

> What important information is missing from each of the following references? a.* Personal communication, 2016. b. Business Week, p. 80. c. Basic Business Communication (Burr Ridge, Ill.: Richard D. Irwin). d. James A. White, “Will the Real S&P 500 Please

> Arrange selected information to form a proper reference for each of the following cases. a.* The title of the article from the Wall Street Journal is “Tallying Up Viewers: Industry Group to Study How a Mobile Nation Uses Media.” It appeared on July 26, 2

> Your boss has just asked you to write a report. Identify the purpose and audience in each of the following situations: a.* The firm is considering expansion of the shipping area. Background material is needed on the size of facilities at other firms. b.

> The unemployment rate can vary from one state to another, and in 2008 the standard deviation was 1.2% for the percent unemployed, which averaged 5.3% at the time. Table 12.5.5 shows these unemployment rates together with two possible explanatory variable

> Networked computers tend to slow down when they are overloaded. The response time is how long it takes from when you press the Enter key until the computer comes back with your answer. Naturally, when the computer is busier (either with users or with oth

> One might expect the price of a tent to reflect various characteristics; for example, we might expect larger tents to cost more, all else equal (because they will hold more people) and heavier tents to cost less, all else equal (because they are harder t