A dataframe in R is a 2-dimensional, rectangular data structure used to store values of any data type. It's a data structure of the base R, meaning that we don't have to install any specific package to create dataframes and work with it. In this exercise, you will create dataframes and perform some initial data analysis. You will explore the mtcars dataset (which is already included in R). Then copy the mtcars dataset into a new variable (called it myCars), so that if you mess up, you can start again (by copying mtcars into myCars again). An interactive tutorial on basic to advanced R features is also available within R itself. It is called Statistics With Interactive R Learning (SWIRL). More information about installing and using this feature can be found at http://swirlstats.com/students.html Review the Readings/Resources in the unit. Complete the following steps: Which car has the best hp (hp stands for "horse power") Is higher or lower hp best? Which car has the best hp? Explore mpg (mpg stands for "miles per gallon") What is the highest mpg? Which car has the highest mpg? Create a sorted dataframe, based on mpg. Which car has the "best" combination of mpg