"Here is a data set from a researcher at an urban university studying people’s attitudes toward environmental stewardship. One of the questions on the survey the researcher administered was asking how people commute to work. The researcher coded data as follows: • car = single occupancy mode of transportation (including motorcylces) • carpool = ride-sharing via private vehicle or shared expense (e. g., taxi or Uber) • transit = public transportation, including bus, train, or subway • bike = assisted self-propelled mode of travel (e. g., bicycle, skateboard or rollerblades) • walk = walking or running."