?Examples 3.3 and 3.4 listed final marks in the business statistics course and the

Gold and precious metals have traditionally been considered a hedge against inflation. If this is true, we would expect that a fund made up of precious metals (gold, silver, platinum, and others) would have a strong positive relationship with the inflation rate. To see whether this is true, a statistics practitioner collected the monthly CPI and the monthly precious metal subindex, which is based on the prices of gold, silver, platinum, and so on for the years 1975 to 2008. These figures were used to calculate the monthly inflation rate and the monthly return on the precious metals subindex. Use a graphical technique to determine the nature of the relationship between the inflation rate and the return on the subindex. What does the graph tell you?

The monthly exchange rate of U.S. dollars to one Australian dollar was recorded from 1971 to 2016. Draw a graph that shows how the exchange rate has varied over the past 41 years.

Studies of twins may reveal more about the “nature” or “nurture” debate. The issue being debated is whether nature or the environment has more effect on individual traits such as intelligence. Suppose that a sample of identical twins was selected and their IQs measured. Use a suitable graphical technique to display the data. Describe what it tells you about the relationship between the IQs of identical twins.

An economist wanted to determine whether a relationship existed between interest rates and currencies (measured in U.S. dollars). He recorded the monthly interest rate and the currency indexes for the years 1982 to 2008. Graph the data and describe the results.

SPAM is an unfortunate fact of life. A random sample of university students was asked to report the number of Spam e-mails they receive in a typical day. Use an appropriate graphical method to display these data.

In Chapters 16, 17, and 18, we introduce regression analysis, which addresses the relationships among variables. One of the first applications of regression analysis was to analyze the relationship between the heights of fathers and sons. Suppose that in a sample of 80 father–son combinations their heights were recorded. a. Draw a graph that displays the relationship. b. What is the direction of the relationship? c. Does it appear that there is a linear relationship between the two variables? Explain.

When the Dow-Jones Industrial Index increases it usually means that the economy is growing, which in turn usually means that the unemployment rate is low. A statistics professor pointed out that in numerous periods (including when this edition was being written) the stock market has been booming while the rest of the economy was performing poorly. To learn more about the issue, the monthly closing DJIA and the monthly unemployment rates were recorded for the years 1950 to 2016. Draw a graph of the data and report your results.

The monthly values of one British pound measured in American dollars since 1971 were recorded. Produce a graph that shows how the exchange rate has varied over the past 45 years.

Do better golfers play faster than poorer ones? To determine whether a relationship exists, a sample of 125 foursomes was selected. Their total scores and the amount of time taken to complete the round were recorded. Graphically depict the data and describe what they tell you about the relationship between total score and time.

he value of monthly U.S. exports to Mexico and imports from Mexico (in $ millions) since 1985 were recorded. a. Draw a chart that depicts exports. b. Draw a chart that exhibits imports. c. Compute the trade balance and graph these data. d. What do these charts tell you?

An increasing number of consumers prefer to use debit cards in place of both cash and credit cards. To analyze the relationship between the amounts of purchases made with debit and credit cards, 240 people were interviewed and asked to report the amount of money spent on purchases using debit cards and the amount of money spent using credit cards during the previous month. Draw a graph of the data and summarize your findings.

Most publicly traded companies have boards of directors. The rate of pay varies considerably. A survey was undertaken by the Globe and Mail wherein 100 companies were surveyed and asked to report how much their directors were paid annually. Use a graphical technique to present these data.

Refer to Exercise 3.97. In addition to reporting the annual payment per director, the survey recorded the number of meetings last year. Use a graphical technique to summarize and present these data.

Is airline travel becoming safer? To help answer this question, a statistics professor recorded the number of fatal accidents involving airliners carrying at least 19 passengers that occurred in the years 1950 to 2014. Use a graphical method to answer the question.

Most car-rental companies keep their cars for about a year and then sell them to used car dealers. Suppose that one company decided to sell the used cars themselves. Because most used car buyers make their decision on what to buy and how much to spend based on the car’s odometer reading, this would be an important issue for the car-rental company. To develop information about the mileage shown on the company’s rental cars, the general manager took a random sample of 658 customers and recorded the average number of miles driven per day. Use a graphical technique to display these data.

Several years ago the Barnes Exhibit toured major cities all over the world, with millions of people flocking to see it. Dr. Albert Barnes was a wealthy art collector who accumulated a large number of impressionist masterpieces; the total exceeds 800 paintings. Because of the size and value of the collection, it was predicted (correctly) that in each city a large number of people would come to view the paintings. Because space was limited, most galleries had to sell tickets that were valid at one time (much like a play). In this way, they were able to control the number of visitors at any one time. To judge how many people to let in at any time it was necessary to know the length of time people would spend at the exhibit; longer times would dictate smaller audiences; shorter times would allow for the sale of more tickets. The manager of a gallery that will host the exhibit realized her facility can comfortably and safely hold about 250 people at any one time. Although the demand will vary throughout the day and from weekday to weekend, she believes that the demand will not drop below 500 at any time. To help make a decision about how many tickets to sell she acquired the amount of time a sample of 400 people spent at the exhibit from another city. What ticket procedure should the museum management institute?

Examples 3.3 and 3.4 listed final marks in the business statistics course and the mathematical statistics course. The professor also provided the final marks in the first-year required calculus course. Graphically describe the relationship between calculus and statistics marks. What information were you able to develop?

Xm03-03*, Xm03-04* In addition to the previously discussed data in Examples 3.3 and 3.4, the professor listed the midterm mark. Conduct an analysis of the relationship between the final exam mark and the midterm mark in each course. What does this analysis tell you?

Xr02-65* Two other questions were asked in Exercise 2.65. Number of weeks job searching? Salary in ($ thousands)?

Xr03-105 The size of the U.S. federal government debt was recorded for every year starting in 1790. (Yes, the government was in debt even then.) Use a graphical technique to display these figures. Briefly describe what the graph tells you

Xr03-106 Use the population of the United States from 1935 to 2015 to compute the per capita debt figures. Briefly describe what you have learned.

Xr03-107 Use the U.S. CPI Annual to adjust the per capita debt figures to 1982–1984 dollars. Graph these figures. Does removing the effect of inflation allay your concerns for the future? Explain.

Xr03-108 The debt owed by the Canadian federal government was recorded for the years 1870 to 2015. Use a graph to present these figures. Should future tax-paying Canadians be concerned? Briefly explain.

Xr03-109 Use the population of Canada from 1870 to compute the per capita debt. Graph the results. What have you learned?

Xr03-110 Use the Canada CPI Annual to calculate the inflation adjusted (using 2002 as the base) per capita debt from 1915 to 2015. Briefly describe your results.