Below are results from a regression analysis. The dependentvariable is the percent vote for Woodrow Wilson in 1916, measuredfrom 0 to 100. Each observation is a New Jersey county, of whichthere are 20. The independent variables are the county’s percentageof Democrats (0 to 100), percentage working class (0 to 100), andthe number of shark attacks that occurred in it in 1916 (0, 1, 2, .. . ). Shark attacks are rare: no county experienced more than3.
| estimate |
| (Intercept) | 0.327 |
| % Democrats | 0.897 |
| % workers | -0.121 |
| # shark attacks | -0.506 |
(a) How do we interpret the coefficient estimate for # sharkattacks? (b) What would be the predicted vote share for Wilson in acounty that is 40% Democratic, has 80% working class, andexperienced no shark attacks? What about if the same countyexperienced 1 shark attack?
