Final answer:
Pie charts are effective for displaying proportions of a whole, but not necessarily better for global comparisons. For datasets with numerous categories or for visualizing trends over time, bar graphs or line graphs might be preferred. The best choice of graph depends on the specific data and analysis goal.
Step-by-step explanation:
False, pie charts are not always better for global comparison. They are generally effective for showing how an overall group is divided into proportions, especially when comparing parts of a whole. However, for global comparisons, in terms of understanding and visualizing trends, changes over time, or comparisons among different groups, bar graphs or line graphs might be superior. Pie charts tend to be less effective when there are too many categories or 'slices,' as this can lead to a cluttered and hard-to-read presentation. Therefore, the choice of which graph to use – whether it is a pie chart, a bar graph, or a line graph – should be based on the type of data and the goal of the analysis.
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For showing percentages, such as the percentage of students in each category of hours played, a pie graph can be effective. However, if you want to represent the total numbers of students or compare data over time, a bar graph would be more appropriate. It's important for colors to be clearly distinguishable and text to be legible in pie charts to effectively convey the information, especially when dealing with smaller sections. A bar graph would typically display bars in chronological order and use distinct colors for different datasets to facilitate easy comparison.