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# Section 2.2-2.3

### Frequency Distributions & Histograms_Probability & Statistics - Math 1530

TermDefinition
Frequency Distribution/Table Shows how a data set is partitioned among all of several categories (or classes) by listing all of the categories along with the number of data value in each of the categories.
Frequency The number of original values that fall into that class.
Lower Class Limits The smallest numbers that can actually belong to different classes.
Upper Class Limits The largest numbers that can actually belong to the different classes.
Class Boundaries "Fence posts"; separates classes; Always 1 more class boundary than the number of classes. Find 2nd boundary by averaging the 1st class upper limit with 2nd lower limit. Add class width to get the others.
Class Midpoints The values in the middle of the classes & can be found by adding the lower class limit to the upper class limit and dividing the sum by two.
Class Width The difference between consecutive lower class limits or two consecutive lower class boundaries.
Relative Frequency Distribution Includes the same class limits as a frequency distribution, but the frequency of a class is replaced with a relative frequencies (a proportion) or a percentage frequency (a percent).
Relative Frequency Histogram Has the same shape & horizontal scale as a histogram, but the vertical scale is marked with relative frequencies instead of actual frequencies.
Normal Distribution "bell" shaped; Frequencies start low, then increase to one or two high frequencies, then decreases to a low frequency. approx symmetric
Histogram Class boundaries, class midpoints, lower class limits. Horizontal: use class boundaries or class midpoints. Vertical: use class frequencies.
Cumulative Frequency Distribution Example: instead of 60-69 it will list "Less than 70"
Created by: hfanch24