Tests for the Regression Coefficients Model Assumptions

Use the data obtained and ANOVA to test whether there is a significant difference in monthly transportation costs for families living in these cities. Assume that α = .05. Report a p-value and interpret the results of the statistical test. 

Use α= 0.05, and construct confidence intervals for all pairs of differences between means. Which of these differences, if any, are statistically significant at the selected significance level?