A student survey was conducted in a major university, where data were collected from a random sample of 750 undergraduate students. One variable that was recorded for each student was the student's answer to the question: " What region of the country did you live in just prior to enrolling in this university? Northeast/Southeast/Northwest/Southwest/Midwest/Outside the US"
These data would be best displayed using which of the following?
a. Histogram
b. IQR
c. pie chart
d. stemplot
e. boxplot