Use the TukeyHSD() function in R to determine differences among treatments after running an ANOVA using Company as the independent variable, and Driver_Salary as the dependent variable. Based on these differences, which Company pays the most?

FedEx has a higher estimated salary than DSL, by approximately $19,917.05 (p-value ~0). FedEx also has a higher estimated salary than UPS, by approximately $9,865.5 (p-value of ~0). Thus, FedEx pays the highest salary.

UPS pays the most, by an estimated $10,051.55 more than DSL, and an estimated $9865.5 more than FedEx (p-values ~0 for both)

DSL pays the most by an estimated 19,917.05 more than FedEx, and an estimated $10,051.55 more than UPS (p-values of ~0 for both)

There is insufficient evidence to determine which company has the highest salary.