Exercises on DataFrames

Exercise 1: Filtering a DataFrame

Using the mtcars dataset, create a new DataFrame that only includes rows where the number of cylinders is greater than 4 and the horsepower is greater than 150.

Exercise 2: Grouping and Summarizing

Using the iris dataset, group the data by species and calculate the mean sepal length for each species.

Exercise 3: Creating a Bar Plot

Using the ggplot2 package, create a bar plot of the number of cylinders in the mtcars dataset.

Exercise 4: Merging DataFrames

Using the dplyr package, merge the mtcars dataset with a new DataFrame that contains the country of origin for each car model.

Exercise 5: Creating a Scatter Plot

Using the ggplot2 package, create a scatter plot of the relationship between horsepower and miles per gallon in the mtcars dataset.