AP* Statistics - Classwork - Distance and Ticket Price Chapter 7 400 350 Atlanta to: Distance Fare Baltimore 568 219 300 Boston 933 222 249 250 Dallas 720 Denver 1 190 308 200 Detroit 602 249 Kansas City 683 141 150 Las Vegas 1719 252 Miami 589 229 Memphis 327 183 200 600 1000 1400 1800 Minneapolis 894 209 dist New Orleans 419 199 NY 749 248 Okla City 749 301 Orlando 392 238 1. Find r. Philadelphia 657 205 2. Explain what / means in this context. St Louis 461 232 Salt Lake 1565 371 Seattle 2150 343 Summary Statistics Mean 853.7 244.33 St Dev 497.8 56.37 Correlation 0.694 3. Find the slope of the regression line. 8. Using those estimates, draw the line on the scatterplot 9. Explain what the y-intercept means in this context. 4. Find the y-intercept of the regression line. 10. Explain what the slope means in this context. 5. Write the equation of the linear model. 11. The fare to fly to Los Angeles, 1719 miles from Atlanta, is $212. Find the residual. 6. Estimate the fare for a 200-mile flight. 12. In general, a positive residual means... 7. Estimate the fare for a 2000-mile flight. 13. In general, a negative residual means...Dependent variable is: fare 400 No Selector 350 R squared = 48.2% R squared (adjusted) = 45.0% s = 41.82 with 18 - 2 = 16 degrees of freedom 250 200 Source Sum of Squares Mean Square F-ratio 150 Regression 26037.4 26037.4 14.9 Residual 27980.6 1748.79 200 600 1200 1800 Variable Coefficient s.e. of Coeff t-ratio prob Constant 177.215 19.99 8.86