A group of items are categorized according to a certain attribute-X, Y, Z-and according to the state

Question:

A group of items are categorized according to a certain attribute-X, Y, Z-and according to the state in which they are produced:

a. Create a comparative (side-by-side) bar chart to compare the numbers of items of each type made in California and New York.
b. Create a stacked bar chart to compare the numbers of items of each type made in the two states.
c. Which of the two types of presentation in parts a and b is more easily understood? Explain.
d. What other graphical methods could you use to describe the data?