What are the appropriate measures of variability for interval data?

For interval data, the appropriate measures of variability include the range, variance, and standard deviation. The range provides a simple measure of spread by indicating the difference between the highest and lowest values. Variance quantifies how much the data points deviate from the mean, while the standard deviation offers a more interpretable measure, representing the average distance of data points from the mean. These measures help in understanding the distribution and consistency of interval data.