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, lower class limit least number that can belong to the class
upper class limit greatest number that can belong to the class
class width the difference between consecutive lower class limits
range The difference between the highest and lowest scores in a distribution
frequency distribution a summary chart, showing how frequently each of the various scores in a set of data
occurs
midpoint the sum of the upper and lower limits of a class divided by two
relative frequency the portion or percentage of data that falls into a particular class (class frequency/sample
size)
cumulative frequency the sum of the relative frequencies of a particular class and all previous classes