Please use R or R studio for the following questions:

1.1 Access the Salaries dataset by using the code: library(car); library(carData); data(Salaries). #install.packages("car") if needed.

1.2 Draw a boxplot for salary by rank and make it horizontal then add appropriate labels & title.

1.3 What is the interquartile range of salary variable?

1.4 Aggregate Salaries data by rank to see how the mean salaries differ across ranks.

1.5 Aggregate Salaries data by rank and discipline to see how the mean salaries differ across ranks and disciplines.