/*b. Fit an overdispersed Poisson model using the same predictors and outcome as in question 1. What happens to the significance of the black coefficient once we allow for extra-Poisson variation?*/ /*Poisson Regression*/ /*1.Fit a Poisson regression model with the number of doctor visits (docvis), as the outcome and health insurance status (private), health status (chronic), gender (female), income (income), and two indicators of ethnicity (black and hispanic).*/