Exam 18: A Roadmap for Analyzing Data

SCENARIO 18-9 What are the factors that determine the acceleration time (in sec.)from 0 to 60 miles per hour of a car? Data on the following variables for 171 different vehicle models were collected: Accel Time: Acceleration time in sec. Cargo Vol: Cargo volume in cu.ft. HP: Horsepower MPG: Miles per gallon SUV: 1 if the vehicle model is an SUV with Coupe as the base when SUV and Sedan are both 0 Sedan: 1 if the vehicle model is a sedan with Coupe as the base when SUV and Sedan are both 0 The regression results using acceleration time as the dependent variable and the remaining variables as the independent variables are presented below. The various residual plots are as shown below. A Roadmap for Analyzing Data 18-63 18-64 A Roadmap for Analyzing Data -True or False: Referring to Scenario 18-9, the 0 to 60 miles per hour acceleration time of a coupe is predicted to be 0.6427 seconds lower than that of a sedan.

SCENARIO 18-1 A real estate builder wishes to determine how house size (House)is influenced by family income (Income), family size (Size), and education of the head of household (School).House size is measured in hundreds of square feet, income is measured in thousands of dollars, and education is in years.The builder randomly selected 50 families and ran the multiple regression.Microsoft Excel output is provided below: -Referring to Scenario 18-1, what minimum annual income would an individual with a family size Of 4 and 16 years of education need to attain a predicted 10,000 square foot home (House = 100)?

From an inventory of 48 new cars being shipped to local dealerships, corporate reports indicate That 12 have defective radios installed.Which of the following distributions would you use to Determine the probability that out of the 8 new cars it just received that, when each is tested, no More than 2 of the cars have defective radios?

True or False: An insurance company evaluates many variables about a person before deciding on an appropriate rate for automobile insurance.A representative from a local insurance agency selected a random sample of 100 insured drivers and recorded, X, the amount of claims each made in the last 3 years.A Pareto chart can be used to present this information.

SCENARIO 18-6 -Referring to Scenario 18-6, in terms of the s in the model, give the mean change in weight- Loss (Y)for every 1 month increase in time in the program When attending the morning Session.

Suppose students arrive at an advising office at a rate of 30 per hour.Which of the following Distributions would you use to determine the probability that the next two students will arrive 30 Minutes apart?

Data on the amount of time spent studying for a particular exam at a high school were collected For 150 students.You want to know half of the students spent at least how much time studying For that exam.Which of the following would you compute?

SCENARIO 18-1 A real estate builder wishes to determine how house size (House)is influenced by family income (Income), family size (Size), and education of the head of household (School).House size is measured in hundreds of square feet, income is measured in thousands of dollars, and education is in years.The builder randomly selected 50 families and ran the multiple regression.Microsoft Excel output is provided below: -Referring to Scenario 18-1, suppose the builder wants to test whether the coefficient on School is Significantly different from 0.What is the value of the relevant t-statistic?

SCENARIO 18-9 What are the factors that determine the acceleration time (in sec.)from 0 to 60 miles per hour of a car? Data on the following variables for 171 different vehicle models were collected: Accel Time: Acceleration time in sec. Cargo Vol: Cargo volume in cu.ft. HP: Horsepower MPG: Miles per gallon SUV: 1 if the vehicle model is an SUV with Coupe as the base when SUV and Sedan are both 0 Sedan: 1 if the vehicle model is a sedan with Coupe as the base when SUV and Sedan are both 0 The regression results using acceleration time as the dependent variable and the remaining variables as the independent variables are presented below. The various residual plots are as shown below. A Roadmap for Analyzing Data 18-63 18-64 A Roadmap for Analyzing Data -Referring to Scenario 18-9, what is the correct interpretation for the estimated coefficient for Sedan?

SCENARIO 18-9 What are the factors that determine the acceleration time (in sec.)from 0 to 60 miles per hour of a car? Data on the following variables for 171 different vehicle models were collected: Accel Time: Acceleration time in sec. Cargo Vol: Cargo volume in cu.ft. HP: Horsepower MPG: Miles per gallon SUV: 1 if the vehicle model is an SUV with Coupe as the base when SUV and Sedan are both 0 Sedan: 1 if the vehicle model is a sedan with Coupe as the base when SUV and Sedan are both 0 The regression results using acceleration time as the dependent variable and the remaining variables as the independent variables are presented below. The various residual plots are as shown below. A Roadmap for Analyzing Data 18-63 18-64 A Roadmap for Analyzing Data -True or False: Referring to Scenario 18-9, the 0 to 60 miles per hour acceleration time of a coupe is predicted to be 0.7679 seconds higher than that of a sedan.

The use of preservatives by food processors has become a controversial issue.Suppose 2 Preservatives are extensively tested and determined safe for use in meats.A processor wants to compare the preservatives for their effects on retarding spoilage.They will choose to use the Preservative that can keep the meat fresh for the longest amount of time.Suppose 15 cuts of Fresh meat are treated with preservative I and 15 are treated with preservative II, and the number Of hours until spoilage begins is recorded for each of the 30 cuts of meat.Suppose the variability Of the number of hours until spoilage is the same for meat treated by both preservatives but the Normal probability plots reveal that the number of hours until spoilage is right-skewed for the 15 Cuts treated by preservative I and left-skewed for the 15 cuts treated with preservative II.Which Of the following tests will be the most appropriate?

A pizza chain is considering opening a new store in an area that currently does not have any such Stores.The chain will open if there is evidence that more than 5,000 of the 20,000 households in The area have a favorable view of its brain.It conducts a telephone poll of 300 randomly selected Households in the area and finds that 96 have a favorable view.Which of the following tests will Be the most appropriate?