Concur Technologies, Inc., is a large expense-management company located in Redmond, Washington. The Wall Street Journal asked Concur to examine the data from 8.3 million expense reports to provide insights regarding business travel expenses. Their analysis of the data showed that New York was the most expensive city, with an average daily hotel room rate of $198 and an average amount spent on entertainment (including group meals and tickets for shows, sports, and other events) of $172. In comparison, the U.S. averages for these two categories were $89 for the room rate and $99 for entertainment. The following table shows the average daily hotel room rate and the amount spent on entertainment for a random sample of 9 of the 25 most visited U.S. cities (The Wall Street Journal, August 18, 2011).

a. Develop a scatter diagram for these data with the room rate as the independent variable.
b. What does the scatter diagram developed in part (a) indicate about the relationship between the two variables?
c. Develop the least squares estimated regression equation.
d. Provide an interpretation for the slope of the estimated regressionequation.

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Room Rate Entertainment City Boston Denver Nashville New Orleans Phoenix San Diego San Francisco San Jose Tampa 148 96 91 110 90 102 136 90 82 161 105 101 142 100 120 167 140 98