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Homework assistance for accounting students. Refer to the Journal of Accounting Education (Vol. 25, 2007) study of assisting accounting students with their homework, Exercise 8.18 (p. 444). A total of 75 junior-level accounting majors who were enrolled in Intermediate Financial Accounting participated in the experiment. Recall that students took a pretest on a topic not covered in class and then each was given a homework problem to solve on the same topic. A completely randomized design was employed, with students randomly assigned to receive one of three different levels of assistance on the homework: (1) the completed solution, (2) check figures at various steps of the solution, and (3) no help at all. After finishing the homework, each student was given a posttest on the subject. The response variable of interest to the researchers was the knowledge gain (or, test score improvement), measured as the difference between the posttest and pretest scores. The data (simulated from
- a. Give the null and alternative hypotheses tested in an analysis of variance of the data.
- b. Summarize the results of the analysis in an ANOVA table.
- c. Interpret the results, practically. Does your conclusion agree with the inferences drawn in Exercise 8.18?
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Chapter 9 Solutions
EBK STATISTICS FOR BUSINESS AND ECONOMI
- Celebrity endorsement has become a popular choice in advertising due to the its originality and the celebrity’s attractiveness that make a big impact on brand awareness and customer behavior. This study analyzes the effect of celebrity endorsement on customer’s attitude toward brand as well as the effect of customer’s attitude toward brand on customer’s purchase intention in Vietnam. A survey was conducted with 306 individuals in Vietnam. After conducting the explanatory factor analysis (EFA), and multi-variable regression analysis, results indicate that customer’s attitude toward brand is positively affected by 03 factors: celebrity match-up congruence with the brand/product, celebrity trustworthiness, and celebrity expertise. Attitude toward brand also has a positive impact on customer’s purchase intention. Based on the scenario presented, answer the following questions: A) Find out Independent, Dependent, Moderating, and Mediating Variables and elaborate…arrow_forwardThe Chi-Squared Test - X² Choco-Zuties, and the other ad was for a new healthy snack called Apple-Zuties. Product advertisers studied the effects of television ads on children's choices for two new snacks. The advertisers used two 30-second television ads in an experiment. One ad was for a new sugary snack called program, the children were offered a choice between the two snacks. The table below summarizes their choices. individually watched a 30-minute television program that was interrupted for 5 minutes of advertising. After the For the experiment, 75 children were randomly assigned to one of three groups, A, B, or C. Each child Number Who Chose Choco-Zuties 21 13 22 Group A B с Kristin Trehame 11-30-20 Chapter 11 Analyzing the Association Between Categorical Variables Type of Ad Choco-Zuties only Apple-Zuties only Neither Number Who Chose Apple-Zuties 4 12 x²=(obs-exp)² exp Do the data provide convincing statistical evidence that there is an association between type of ad and…arrow_forwardA study was done in 1998 by Dr. Benjamin Levine to explore the role of altitude training in athletic performance. First, he trained athletes at low altitude, then measured their finish times in a 5 kilometer run. Then the athletes were placed into one of the following groups: I, living and training at high altitude; Il, living at high altitude and training at low; or Ill, living and training at low altitude. The athletes were then retested in another low-altitude 5 K race. In this study, what are the control and experimental data? What are the dependent and independent variables? The results are expressed as average change in speed of each group. I: -3.4 sec., Il: +13.4 sec., Ill: -26.7 sec. a. Graph and interpret the results. b. Did the results surprise you? Why or why not? c. Explain why the three groups obtained the results presented? d.How did altitude affect blood composition and why? e.How would athletes' performance be affected if they live, train, and compete at different…arrow_forward
- A group of health professionals produced a cholesterol drug. To measure the effectiveness of this drug they implemented a program that offered free drugs to people to decrease their cholesterol level. Health professionals also collected a sample of people, who did not have the drug, to act as a control group. Health professionals then measured cholesterol level of all individuals in year 1, before any cholesterol drug were given out, and then measured the same group of individuals again in year 2 after the cholesterol drugs had been administered. Consider the following model to evaluate the effectiveness of the drug on people's cholesterol level: cholie = Bo + 8od2, + B1drugit + Vịt chol= cholestrol of individual i, in year t d2;= binary variable equal to 1 if the time period is year 2, and 0 otherwise drug= binary variable equal to 1 if individual i took the drug in year t, and 0 otherwise V= composite error consisting of the unobserved, time-constant effect (a;) and the idiosyncratic…arrow_forwardAllegiant Airlines is considering an overbooking policy for one of its flights. The airplane has 50 seats, but Allegiant is considering accepting more reservations than seats because sometimes passengers do not show up for their flights, resulting in empty seats. The PassengerAppearance worksheet in the file Overbooking contains data on 1,000 passengers showing whether or not they showed up for their respective flights. In addition, Allegiant has conducted a field experiment to gauge the demand for reservations for the current flight. During this experiment, they did not limit the number of reservations for the flight to observe the uncensored demand. The following table summarizes the result of the field experiment. No. of Reservations Demanded Probability 48 0.05 49 0.05 50 0.15 51 0.30 52 0.25 53 0.10 54 0.10 Suppose Allegiant receives a marginal profit of $108 for each passenger who books a reservation (regardless of whether they show up). In addition, suppose…arrow_forwardMany parents allow underage children to drink alcohol in limited situations when an adult is present to supervise. The idea is that teens will learn responsible drinking habits if they first experience alcohol in a controlled environment. Other parents take a strict no-drinking approach. Researchers surveyed a sample of 200 students aged 14 to 17, about their alcohol use and about alcohol related problems. Using a=0.05, answer the questions No Alcohol related Problems Alcohol Related Problems Not allowed to drink 71 9 80 Allowed to drink 89 31 |120 160 40 N=200 What is the alternative hypothesis? [ Select] What is the null hypothesis? [ Select] What inferential test is being conducted? [ Select] What is the obtained statistic? [ Select ] What determines the critical value? [ Select ] What is the critical value? [ Select ] What is the decision rule? [ Select] What is your decision? [ Select] What is your conclusion? [ Select ]arrow_forward
- What sampling technique is used? In a research class of 40 students, the teacher divides the class into five groups, each with eight members per group. The teacher then asked the class to choose their group members based on interests, compatibility, and rapport. After the selection was made, the teacher realized that the abilities per group were uneven. He then reshuffled some members of the group to achieve equilibrium among the groups. The teacher needs ten students to represent each group. He selected one male and one female from each group based on academic performance, leadership skills, and social skills as qualities that will embody as representatives per group.arrow_forwardThe manager of a men’s clothing catalog measured the market’s response to a $6 decrease in the usual price of his company’s oxford shirts by conducting a sales experiment. An A-B split was used to divide the company’s 120,000-customer mailing list into two groups. Customers in the control group were sent catalogs listing oxford shirts at their usual price of $40. Customers in the test group were sent catalogs listing the price of oxford shirts at $32.80. During the period of the test, customers in the control group purchased 700 oxford shirts, and customers in the test group purchased 889 oxford shirts. What is the independent variable in this sales experiment? What is the dependent variable in this sales experiment? What is the percent change in price in this experiment? What is price elasticity indicated by the results of this experiment.arrow_forwardQuestion 2 In the past, 15% of the mail order solicitations for a certain charity resulted in a financial contribution. A new solicitation letter that has been drafted is sent to a sample of 200 people and 45 responded with a contribution. At the .05 significance level can it be concluded that the new letter is more effective?arrow_forward
- Previous answer was poorly formatedarrow_forwardA government study found that people who eat chocolate frequently weighless than people who don’t. Researchers questioned 1000 individuals fromCalifornia between the ages of 20 and 85 about their eating habits, andmeasured their weight and height. On average, participants ate chocolatetwice a week and had a body mass index (BMI) of 28. There was anobserved difference of five to seven pounds in weight between those whoate chocolate five times a week and those who did not eat any chocolate atall, with the chocolate eaters weighing less on average. Frequent chocolateeaters also consumed more calories, on average, than people who consumedless chocolate. Based on this summary, would you recommend thatAmerican’s who do not presently eat chocolate, consider eating chocolateup to five times a week if they want to lose weight? Why or why not?Explain.arrow_forward7. Some years ago, a new brand of toothpaste was introduced in the United States. According to its advertisements, studies showed that it had "considerable success" in improving the health of a person's teeth. Suppose that these studies were designed in the following way. The manufacturer of this toothpaste chose three samples of seven people; the first sample agreed to use the new brand, the second sample used Brand A, and the third sample used Brand B. After six months, a dentist examined each person's teeth and scored the health of his or her teeth on a scale of 0 (lowest possible score) to 100 (highest possible score). The results were as follows: New Brand Brand A Brand B 65 58 54 71 60 38 53 63 43 55 90 61 34 95 94 82 89 96 77 62 82 The manufacturer of the new toothpaste says that the average score for the new brand is 2 points higher than for Brand A and 4 points higher than for Brand B. Would you agree with the manufacturer's advertisements? Explain.arrow_forward
- Principles of Economics (12th Edition)EconomicsISBN:9780134078779Author:Karl E. Case, Ray C. Fair, Sharon E. OsterPublisher:PEARSONEngineering Economy (17th Edition)EconomicsISBN:9780134870069Author:William G. Sullivan, Elin M. Wicks, C. Patrick KoellingPublisher:PEARSON
- Principles of Economics (MindTap Course List)EconomicsISBN:9781305585126Author:N. Gregory MankiwPublisher:Cengage LearningManagerial Economics: A Problem Solving ApproachEconomicsISBN:9781337106665Author:Luke M. Froeb, Brian T. McCann, Michael R. Ward, Mike ShorPublisher:Cengage LearningManagerial Economics & Business Strategy (Mcgraw-...EconomicsISBN:9781259290619Author:Michael Baye, Jeff PrincePublisher:McGraw-Hill Education
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