American Institute of Certified Planners (AICP) Practice Exam

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What does the range measure in a dataset?

The average of the values
The total count of data points
The difference between the highest and lowest scores
The median of the values

The correct answer is: The difference between the highest and lowest scores

The range in a dataset is defined as the difference between the highest and lowest values, which effectively captures the spread of data points. By determining the range, planners and analysts can assess the variability within a dataset, which is crucial for understanding distribution and making informed decisions. This measure is particularly useful because it provides a straightforward indication of how much the values in the dataset differ from one another. A larger range suggests more dispersion, while a smaller range indicates that the data points are more clustered together. Understanding the range is essential in various planning contexts, as it can help identify inequalities, predict trends, and evaluate the robustness of the data being analyzed. Other statistical measures, such as averages or medians, focus on central tendency and may not accurately reflect the variability found within the dataset.