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Graphs representing trends in data are primarily used to show what?

Random acts and occurrences

Financial benefits

Changes over time

Graphs are tools that visually represent data and are particularly effective in illustrating trends and patterns. When it comes to showing trends, graphs excel in displaying changes over time. By plotting data points on a timeline, graphs can reveal how measurements fluctuate, grow, or decline, making it easier to analyze and interpret those changes.

For instance, in wastewater management, a graph could represent the concentrations of pollutants over several months, allowing managers to see how treatment efforts impact levels over time. This capability to visualize temporal changes helps inform decision-making and strategy development.

The other options do not capture the primary function of graphs. Random acts and occurrences, financial benefits, and personnel schedules involve different types of data representation that do not focus on the changes and trends over a specific duration, which is the core strength of graphical data representation.

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Laboratory personnel schedules

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