Final answer:
A pie graph would be best for showing the percentage of students in different categories, while a bar graph would be better for comparing total numbers. Colors should be consistent and legible on both types of graphs.
Step-by-step explanation:
A pie graph would be best for showing the percentage of students that fall into each Hours Played category. A bar graph would be more desirable if knowing the total numbers of students in each category is important. I would be sure that the colors used on the two pie graphs are the same for each category and are clearly distinguishable when displayed. The percentages should be legible, and the pie graph should be large enough to show the smaller sections clearly. For the bar graph, I would display the bars in chronological order and make sure that the colors used for each researcher's data are clearly distinguishable. The numbers and the scale should be legible and clear when the bar graph is displayed.