Lab Homework #4

Question #1: What is the most popular fuel type in mpg data set?

ggplot(mpg) +
  geom_bar(aes(x = fl, color = fl, fill = fl))

Answer: According to the figure, r(regular petrol) is the most popular type of fuel

Regarding the fuel type variable, the value “d” represents diesel, “p” represents

Question #2: Regarding the fuel type variable, the value “d” represents diesel, “p” represents premium (petrol) and “r” represents regular (petrol). Do you think there is an effect of fuel type on how many miles a vehicle can run on average per gallon of fuel?

ggplot(data = mpg) +
  geom_boxplot(mapping = aes(x= fl, y= hwy))

ggplot(data = mpg) +
  geom_boxplot(mapping = aes(x= fl, y= cty))