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This Concept Map, created with IHMC CmapTools, has information related to: Topic 8 Descriptive Stats, mode = most mainly used for categorical variables or data particularly nominal data, mode = most is the value that occurs most frequently, Standard Deviation most widely used measure of dispersion particularly with interval and ration level data, Range difference between the highest and lowest scores tells us nothing about how the data is spread, median = mid point is the middle value in a ranked list, Standard Deviation indicates the average distance or amount by which each observation differs from the mean, mean = average if meaningfully different from median, median = mid point provides better measure of central tendencies, Descriptive statistics include Measures of Dispersion, Measures of Central Tendency include mean = average, Measures of Dispersion describe the spread of observations/ data, median = mid point is often paired with other information about the distribution, spread of observations/ data about the mean, Measures of Dispersion include Range difference between the highest and lowest scores, Measures of Central Tendency include median = mid point, Measures of Dispersion include Inter-quartile range (IQR), mean = average sensitive to extreme values, extreme values known as outliers, mean = average not appropriate for skewed distribution of data, Inter-quartile range (IQR) is the difference between first and third quartiles