The U.S. Department of Education reported that 14% of adults were classified as being below a basic literacy level, 29% were classified as being at a basic literacy level, 44% were classified as being at an intermediate literacy level, and 13% were classified as being at a proficient level (2003 National Assessment of Adult Literacy).
a. Is the variable literacy level categorical or numerical?
b. Would it be appropriate to display the given information using a dotplot? Explain why or why not.
c. Construct a bar chart to display the given data on literacy level.