# Question: Almost all U S light rail systems use electric cars that run

Almost all U.S. light-rail systems use electric cars that run on tracks built at street level. The Federal Transit Administration claims light-rail is one of the safest modes of travel, with an accident rate of .99 accidents per million passenger miles as compared to 2.29 for buses. The following data show the miles of track and the weekday ridership in thousands of passengers for six light-rail systems (USA Today, January 7, 2003).

a. Use these data to develop an estimated regression equation that could be used to predict the ridership given the miles of track.

b. Did the estimated regression equation provide a good fit? Explain.

c. Develop a 95% confidence interval for the mean weekday ridership for all light-rail systems with 30 miles of track.

d. Suppose that Charlotte is considering construction of a light-rail system with 30 miles of track. Develop a 95% prediction interval for the weekday ridership for the Charlotte system. Do you think that the prediction interval you developed would be of value to Charlotte planners in anticipating the number of weekday riders for their new light rail system? Explain.

a. Use these data to develop an estimated regression equation that could be used to predict the ridership given the miles of track.

b. Did the estimated regression equation provide a good fit? Explain.

c. Develop a 95% confidence interval for the mean weekday ridership for all light-rail systems with 30 miles of track.

d. Suppose that Charlotte is considering construction of a light-rail system with 30 miles of track. Develop a 95% prediction interval for the weekday ridership for the Charlotte system. Do you think that the prediction interval you developed would be of value to Charlotte planners in anticipating the number of weekday riders for their new light rail system? Explain.

**View Solution:**## Answer to relevant Questions

The commercial division of a real estate firm is conducting a regression analysis of the relationship between x, annual gross rents (in thousands of dollars), and y, selling price (in thousands of dollars) for apartment ...Consider the following data for two variables, x and y. a. Compute the standardized residuals for these data. Do the data include any outliers? Explain. b. Compute the leverage values for these data. Do there appear to be ...In a manufacturing process the assembly line speed (feet per minute) was thought to affect the number of defective parts found during the inspection process. To test this theory, managers devised a situation in which the ...Consider the following data for a dependent variable y and two independent variables, x1 and x2. a. Develop an estimated regression equation relating y to x1. Estimate y if x1 = 45. b. Develop an estimated regression ...Exercise 5 gave the following data on weekly gross revenue, television advertising, and newspaper advertising for Showtime Movie Theaters. a. Find an estimated regression equation relating weekly gross revenue to television ...Post your question