Question: Can we infer that there are differences

> Refer to Exercise 16.56. Total family income of a family with four earners. Data from Exercise 16.56: How does having more family members earning income (EARNRS) affect total family income (INCOME)? Conduct an analysis to determine whether there is a po

> The cost of taking an extra year to earn an MBA is quite high. To determine whether it is worthwhile, a BBA graduate surveyed 200 people who had either a BBA or an MBA and recorded their annual salary (in $1,000s) after 5 years of work. The student deter

> Refer to Exercise 16.55. Number of hours of television per day of a 65-year-old. Data from Exercise 16.55: Television advertisers always want to know who is watching their televised advertising. Do older people watch more television than do younger peop

> Refer to Exercise 16.54. Number of hours of t work per week for some who is 60 years old. Data from Exercise 16.54: Is there a linear relationship between age (AGE) and how many hours per week one works (HRS1)? Conduct a test to answer the question.

> Refer to Exercise 16.53. Income of someone who works 40 hours per week. Data from Exercise 16.53: It seems rather obvious that the longer one works the more one earns. The question is how much more one earns annually for each additional hour of work. Co

> Refer to Exercise 16.52. Number of hours of television watching per day for people with 12 years of education. Data from Exercise 16.52: Does television appeal to the lowest common denominator? If so, we would expect more educated people to watch less t

> Refer to Exercise 16.51. Annual income of someone who is 45 years old. Data from Exercise 16.51: Conduct an analysis of the relationship between income (RINCOME) and age (AGE). Estimate with 95% confidence the average increase in income for each additio

> How does educational attainment affect newspaper readership? Is there enough evidence to conclude that there are differences between the five educational attainment groups (DEGREE: Highest degree completed of respondent, spouse, father, mother: 0 = Left

> Are there differences between the races with respect to their perceptions of their health (HEALTH: Would you say your own health, in general, is . . . 1. Excellent, 2. Good, 3. Fair, 4. Poor)? Use an appropriate statistical technique to determine whether

> Can we infer from the data that liberals, moderates, and conservatives (POLVIEWS3: 1 = Liberal, 2 = Moderate, 3 = Conservative) differ in their views about the federal income tax that they have to pay (TAX: Do you consider the amount of federal income ta

> Is there enough statistical evidence to conclude that Democrats, Republicans, and Independents (PARTYID3: 1 = Democrat, 2 = Independent, 3 = Republican) differ in their views about the federal income tax that they have to pay (TAX: Do you consider the am

> Is there enough statistical evidence to infer that there are differences between the three race categories (RACE) with respect to how likely they are to lose their jobs (JOBLOSE: 1 = Very likely, 2 = Fairly likely, 3 = Not too likely, 4 = Not likely)?

> In Chapter 7, we showed that diversification reduces the risk associated with a portfolio of investments. (Most experts advise their clients that the portfolios should contain between 20 and 30 stocks scattered in different industries.) Do investors unde

> Do less-educated people believe that they have a higher probability of losing their job? Test to determine whether there is enough evidence to conclude that there are differences in perceived likelihood of losing their jobs ( JOBLOSE: 1 = Very likely, 2

> Are there differences between the five categories of marital status (MARITAL) with respect to health (HEALTH: 1 = Excellent, 2 = Good, 3 = Fair, 4 = Poor)? Conduct a statistical test to answer the question.

> Respondents were asked the following question, Compared to your parents at your age is your standard of living (PARSOL: 1 = Much better, 2 = Somewhat better, 3 = About the same, 4 = Somewhat worse, 5 = Much worse)? Test to determine whether we can infer

> Do more educated people derive more satisfaction from their jobs? Test to determine whether there are differences in job satisfaction (SATJOB: 1 = Very satisfied, 2 = Moderately satisfied, 3 = A little dissatisfied, 4 = Very dissatisfied) between the deg

> Do married couples typically have the same completed degrees? Conduct a test to determine whether there is enough evidence to conclude that married couples do not have the same degrees (DEGREE, SPDEG, Highest degree completed of respondent and spouse: 0

> The survey asked these two questions. 1. Compared to your parents at your age is your standard of living . . . (PARSOL: 1 = Much better, 2 = Somewhat better, 3 = About the same, 4 = Somewhat worse, 5= Much worse)? 2. When your children are at your age wi

> Are harder-working Americans more likely to urge to want government to reduce income differences? Test to determine whether there is sufficient evidence of a positive linear relationship between hours of work per week (HRS1) and position on whether gover

> Refer to Exercise 16.63. Is there sufficient evidence of a positive linear relationship between the years of education (EDUC) and the years of education of one’s mother (MAEDUC)? Data from Exercise 16.63: Does the amount of education that one completes

> Does the amount of education that one completes influence the amount of education his son or daughter completes? Test the relationship between a person’s education (EDUC) and his or her father’s education (PAEDUC).

> Refer to Exercise 16.61. We would expect that more educated people would have fewer children. Analyze the relationship between education (EDUC) and number of children (CHILDS). Data from Exercise 16.61: Does staying in university longer mean that postpon

> An important measure of the health of a nation’s economy is total debt. A Canadian survey asked a random sample of households how much money (in $1,000s) they owed. This includes mortgages, loans, and credit card debt. Assuming that there are 10 million

> Does staying in university longer mean that postpone having children? If so, we would expect a positive linear relationship between years of education (EDUC) and the age when one has his or her first child (AGEKDBORN). Test to determine whether there is

> If one spouse works longer hours does this mean that the other spouse also works longer hours? Test the relationship between HRS1 and SPHRS1 to answer the question.

> An economic theory suggests that as people become richer they tend to have more children. Analyze the relationship between income (INCOME) and number of children (CHILDS) to test the theory.

> Do more educated people tend to marry individuals with similar educational experience? Test to determine whether a married person’s years of education (EDUC) are positively linearly related to his or her spouse’s level of education (SPEDUC).

> Were Americans more optimistic about their children’s standard of living (KIDSSOL: When your children are at the age you are now, do you think their standard of living will be 1 = Much better, 2 = Somewhat better, 3 = About the same, 4 = Somewhat worse,

> Were Americans more worried about their chances of losing their jobs (JOBLOSE: 1 = Very likely, 2 = Fairly likely, 3 = Not too likely, 4 = Not likely) in 2012 than in 2014?

> Is there sufficient evidence to infer that Americans were healthier (HEALTH: 1 = Excellent, 2 = Good, 3 = Fair, 4 = Poor) in 2012 than in 2014?

> It is well known that on average women live about four years longer than men. However, are they healthier? Conduct a test to determine if women (SEX: 1 = Male, 2 = Female) consider themselves to be healthier than men (HEALTH: 1 = Excellent, 2 = Good, 3 =

> Can we infer that women are more likely than men to lose their jobs in the next 12 months (JOBLOSE: In the next 12 months how likely is it that you will lose your job or be laid off: 1 = Very likely, 2 = Fairly likely, 3 = Not too likely, 4 = Not likely)

> Refer to Exercise 17.20. a. Calculate the correlation between the independent variables. Does it indicate the presence of multicollinearity? Explain. b. Test the correlation between each independent variable and the dependent variable. Which independent

> Refer to Exercise A19.9. The economist also wanted to know whether there are differences in miles driven between cars, buses, and vans, pickups, and SUVs. Data from Exercise A19.9: The high price of gasoline is likely to lead to less travel. An economis

> Refer to Exercise 17.19. a. Calculate the correlation between the independent variables. Does it indicate the presence of multicollinearity? Explain b. Test the correlation between each independent variable and the dependent variable. Which independent

> Refer to Exercise 17.18. Calculate the correlation between the father’s and the mother’s years of education. Is there any sign of multicollinearity? Explain. Data from Exercise 17.18: How does the amount of education of one’s parents (PAEDUC, MAEDUC) af

> Refer to Exercise 17.21. a. Calculate the correlation matrix. b. Are there signs of the presence of multicollinearity? Explain. c. Test the correlation between each independent variable and the dependent variable. Which independent variables are linearly

> Refer to Exercise 17.24. Run a stepwise regression and report the differences between this regression and the one in Exercise 17.24. Data from Exercise 17.24: Repeat Exercise 17.23 for expenditures on food away from home (FOODAWAY).

> Refer to Exercise 17.21. Use stepwise regression to answer the question. Data from Exercise 17.21: What determines people’s opinion on the following question, Should the government improve the standard of living of poor people (HELPPOOR: 1 = Government

> Refer to Exercise 17.20. Use stepwise regression to calculate the equation. Data from Exercise 17.20: The Nielsen Ratings estimate the number of televisions tuned to various channels. However, television executives need more information. The General Soc

> Refer to Exercise 19.24. Is there sufficient evidence to infer that people who work for themselves (WRKSLF: 1 = Self-employed, 2 = Work for someone else) differ from those who work for someone else with respect to how they describe the federal income tax

> Do Democrats and Republicans (PARTYID3:1 = Democrat, 3 = Republican) differ in their views about the federal income tax that they have to pay (TAX: Do you consider the amount of federal income tax which you have to pay as too high, about right, or too lo

> Almost everyone dreams of being richenough to quit working. Respondents were asked, If you were to get enough money to live as comfortably as you would like for the rest of your life, would you continue to work, or would you stop working (RICHWORK: 1 = C

> Can we infer that men and women (SEX: 1 = Male, 2 = Female) differ in their preference for work that is important and gives a feeling of accomplishment?

> The high price of gasoline is likely to lead to less travel. An economist specializing in energy uses wanted to learn more about driving habits, and, in particular, distances traveled by cars, buses, vans, and trucks. In the latest year data were availab

> Working for one’s self generally means that the amount of time devoted to work is up to the individual. Is there sufficient evidence to conclude that people who work for themselves (WRKSLF: 1 = Self , 2 = Someone else) prefer shorter work hours with lots

> There appear to be many attractive featuresof government jobs, the most attractive being job security. But is this actually the case? Conduct a test to determine whether government workers (WRKGOVT: 1 = Government, 2 = Private) show a greater preference

> To determine the effect of union membership run a regression with income (RINCOME) as the dependent variable and age (AGE), education (EDUC), number of hours worked per week (HRS1), and union membership (UNION:1 = Respondent belongs, 2 = Spouse belongs,

> Conduct a regression analysis with position on the question, should the government help poor people (HELPPOOR: 1 = Government action; 2, 3, 4, 5 = People should help themselves) as the dependent variable and age (AGE), income (RINCOME), education (EDUC),

> Conduct a regression analysis with number of hours of television per day (TVHOURS) to determine whether there is enough evidence to infer that there are differences between the three race categories (RACE: 1 = White, 2 = Black, 3 = Other) after removing

> Can we infer that there are differences in income (RINCOME) between people who work for the government and people who work for private employers (WRKGOVT: 1 = Government, 2 = Private) after removing the effects of age (AGE), education (EDUC), and weekly

> Conduct a regression analysis with position on the question, should the government help poor people? Use (HELPPOOR: 1 = Government action; 2, 3, 4, 5 = People should help themselves) as the dependent variable and age (AGE), education (EDUC), income (RINC

> Can we infer that men and women (SEX: 1 = Male, 2 = Female) differ in the amount of television per day (TVHOURS) after removing the effects of age (AGE) and education (EDUC)?

> Repeat Exercise 18.25 using political views (POLVIEWS3: 1 = Liberal, 2 = Moderate, 3 = Conservative) instead of political party. a. Is there sufficient evidence to infer that liberals are more likely than moderates to believe that government should reduc

> The issue of immigration, legal and illegal, has political and economic ramifications. An important component of the issue is how well immigrants integrate into the American economy. A University of Florida study attempted to answer this question. Resear

> Develop a multiple regression model with the position on the question, should the government reduce income differences (EQWLTH: 1 = Government should reduce income differences; 2, 3, 4, 5, 6, 7 = No government action) as the dependent variable and age (A

> a. Conduct a regression analysis with income (RINCOME) as the dependent variable and age (AGE), education (EDUC), number of hours of work (HRS1), and whether someone worked for him or herself (WRKSLF: 1 = Self, 2 = Someone else) as independent variables.

> Can we infer that men and women (SEX: 1 = Male, 2 = Female) differ in their preference for jobs where there is a chance for advancement?

> Refer to Exercise 19.21. For those who would continue working is it because they consider the work important? Test to determine whether those who would continue working have a higher preference for work they consider important and gives them a feeling of

> What determines people’s opinion on the following question, Should the government improve the standard of living of poor people (HELPPOOR: 1 = Government act; 2, 3, 4, 5 =People should help themselves)? a. Develop a regression analysis using demographic

> The Nielsen Ratings estimate the number of televisions tuned to various channels. However, television executives need more information. The General Social Survey may be the source of this information. Respondents were asked to report the number of hours

> What determines people’s opinion on the following question? Should the government reduce income differences between rich and poor (EQWLTH: 1 = Government should reduce differences; 2, 3, 4, 5, 6, 7 = No government action). a. Develop a regression analysi

> How does the amount of education of one’s parents (PAEDUC, MAEDUC) affect your education (EDUC)? a. Develop a regression model. b. Test the validity of the model. c. Test the two slope coefficients. d. Interpret the coefficients.

> Do men (SEX: 1 = Male, 2 = Female) prefer jobs with higher incomes more than do women? Conduct a statistical test to answer the question.

> Repeat Exercise 16.74 for amount spent on food away from home (FOODAWAY). Data from Exercise 16.74: How much more do households have to spend on food when there are children living at home?

> Why do some students do well in university while others struggle? To help answer this question, a random sample of first-year students at four universities was selected. Those who had a grade point average of more than 3.0 (group 1) and those who had a g

> During the decade of the 1980s, professional baseball thrived in North America. However, in the 1990s attendance dropped, and the number of television viewers also decreased. To examine the popularity of baseball relative to other sports, surveys were pe

> How much more do households have to spend on food when there are children living at home? a. Conduct a test to determine whether there is evidence of a positive linear relationship between total annual amount spent on food at home (FOODHOME) and number o

> It takes many years to build up capital gains. Use a statistical analysis to determine whether there is enough evidence to conclude that as one grows older one increases unrealized capital gains (AGE, KGTOTAL). What is the p-value of the test?

> Another way to interpret the results of Exercise 16.71 is that older people spend less on all food because their families are smaller (children have left home) or that they eat less expensive meals. If so, then we would expect that age (AGE) and amount s

> Are younger middle-class people more likely to eat out at restaurants than older people? Conduct a test to determine whether there is sufficient evidence to infer that age (AGE) and amount spent on food away from home (FOODAWAY) are negatively related?

> It seems obvious that for people who take out student loans more years of education lead to larger student debt. a. Conduct a test to determine whether there is a positive linear relationship between years of education (EDUC) and total value of student l

> An increasing number of people are attending colleges and universities. The effect of this trend is that younger people will be more educated than older people. Conduct a test to determine whether age (AGE) and years of education (EDUC) are negatively li

> Do you need more years of education to get further into debt? This question can be answered by determining the relationship between number of years of education (EDUC) and household debt (DEBT). Undertake a regression analysis to determine the following.

> How does education (EDUC) affect financial success among the heads of middle-class households? Conduct a regression analysis and determine the following. a. Is there evidence of a positive linear relationship between education and total financial assets

> We who educate would like to believe that people who have more education are more likely to do well professionally and financially. Fortunately, we have a number of surveys with real data to confirm our beliefs. Analyze the relationship between years of

> Exercise 13.80 asked whether there is enough evidence to conclude that households whose heads have some college (EDCL: 3 = some college, 4 = college degree) have less debt (DEBT) than households whose heads completed a college degree. a. In order to use

> Refer to A19.5. To acquire information about who is shopping downtown, the statistics practitioner also recorded the annual household income (in $1,000s) of the respondents. Is there enough evidence to infer that affluent people shop downtown more freque

> Refer to Exercise 13.77. a. What is the required condition to apply the t-test of two means to determine whether there is enough evidence to conclude that male heads of households (HHSEX: 1 = Male, 2 = Female) have higher incomes than do female heads of

> Exercise 13.70 asked, “Is there sufficient evidence that middle-class heads of households who work for someone else (OCCAT1: 1 = Someone else, 2 = Self-employed/partnership) have higher incomes that heads of households who are self-employed (INCOME)?” a.

> Refer to Exercise 13.79, which asked whether there is enough evidence to conclude that heads of households with college degrees (EDCL: 3 = some college, 4 = college degree) have more assets than those who have some college (ASSET). a. The appropriate tec

> Repeat Exercise 17.23 for expenditures on food away from home (FOODAWAY).

> How are middle class households’ expenditures on food eaten at home affected by the age, education, and income of the head of the household? To answer the question conduct a regression analysis using FOODHOME as the dependent variable and AGE, EDUC, and

> How does age and education affect income among middle-class households? To answer the question, conduct a regression analysis of the dependent variable INCOME using the independent variables AGE and years of education (EDUC). a. Estimate the regression c

> A number of retailers regularly survey their customers to determine among other things, whether they were happy with their purchase or service and whether they intended to return. A chain of hardware stores/automobile service centers is one such company.

> In addition to analyzing the relationship between the managers’ characteristic and the performance of the fund, researchers wanted to determine whether the same characteristics are related to the behavior of the fund. In particular, they wanted to know w

> There are thousands of mutual funds available (see page 161 for a brief introduction to mutual funds). There is no shortage of sources of information about them. Newspapers regularly report the value of each unit, mutual fund companies and brokers advert

> Ontario high school students must complete a minimum of six Ontario Academic Credits (OACs) to gain admission to a university in the province. Most students take more than six OACs because universities take the average of the best six in deciding which s

> In city after city, downtown cores have become less and less populated and poorer because shoppers have taken their money to the suburbs and to shopping malls. One reason often given for the decline in downtown shops is the difficulty in parking. To shed

> I C16-01 n July 1990, a rock-and-roll museum opened in Atlanta, Georgia. The museum was located in a large city block containing a variety of stores. In late July 1992, a fire that started in one of these stores burned the entire block, including the mus

> The manager of a large shopping center in Buffalo is in the process of deciding on the type of snowclearing service to hire for his parking lot. Two services are available. The White Christmas Company will clear all snowfalls for a flat fee of $40,000 fo

> Refer to Exercise 22.7. Assume that the probability of each value of demand is the same for all possible demands. a. Determine the EMV decision. b. Determine the EOL decision. Data from Exercise 22.7: A baker must decide how many specialty cakes to bake

> A baker must decide how many specialty cakes to bake each morning. From past experience, she knows that the daily demand for cakes ranges from 0 to 3. Each cake costs $3.00 to produce and sells for $8.00, and any unsold cakes are thrown into the garbage

> If we assign the following probabilities to the states of nature in Exercise 22.5, determine the EOL decision: P(s1) = .2 P(s2) = .6 P(s3) = .2

> Refer to Exercise 22.4. Set up the opportunity loss table. Data from Exercise 22.4: Given the following payoff table, draw the decision tree: a az az 20 5 -1 8 5 4 S3 -10 5 10

> A major movie studio has just completed its latest epic, a musical comedy about the life of Attila the Hun. Because the movie is different (no sex or violence), the studio is uncertain about how to distribute it. The studio executives must decide whether

> The Megabuck Computer Company is thinking of introducing two new products. The first, Model 101, is a small computer designed specifically for children between ages 8 and 16. The second, Model 202, is a medium-size computer suitable for managers. Because

> Max the Bookie is trying to decide how many telephones to install in his new bookmaking operation. Because of heavy police activity, he cannot increase or decrease the number of telephones once he sets up his operation. He has narrowed the possible choic

> Suppose that in Exercise 22.39 a sample of size 5 showed that only one person believes the new ad. In light of this additional information, what should the manager do?