Which type of chart shows differences in frequencies or percentages among categories?

• A. Histogram
• B. Line graph
• C. Pie Chart
• D. Bar graph

Answer: (C)

The main idea is to show how big each category is as a share of the whole. A pie chart does this by dividing a circle into slices where each slice’s size is proportional to that category’s frequency or percentage. Because the slices collectively represent 100%, you can immediately see which categories contribute more or less to the total and compare their relative proportions at a glance.

Histogram focuses on distribution of a numeric variable, line graph tracks change over time, and while a bar graph can compare category values, it doesn’t emphasize the part-versus-whole relationship as clearly as a pie chart.