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1

frequency distribution

a graphical representation of measurements arranged by the number of times each measurement was made

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2

relative frequency distribution

A tabular summary of data showing the fraction or proportion of observations in each of several nonoverlapping categories or classes.

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3

relative frequency

the fraction or percent of the time that an event occurs in an experiment, take the frequency in a category and divide by the total number of observations

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4

bar graph

height of each bar is either the freq. or the relative freq. of the category

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5

pareto chart

Categories are displayed in descending order of frequency, tallest to shortest

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6

pie chart

a type of graph in which a circle is divided into sectors that each represent a proportion of the whole. useful when showing the division of all possible values of a qualitative variable, emphasis on comparing the part as a whole

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7

bar graphs

Useful when comparing two specific different quantities or when tracking change over time, NOT necessarily on the part as a whole

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8

dot plot

a graphical device that summarizes data by the number of dots above each data value on the horizontal axis better for small data sets

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9

stem and leaf plot

A method of graphing a collection of numbers by placing the "stem" digits (or initial digits) in one column and the "leaf" digits (or remaining digits) out to the right. better fit small data sets

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10

histogram

A graph of vertical bars representing the frequency distribution of a set of data. better for large data sets, more sophisticated

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11

classes

largest data - smallest data / # of classes (5-20)

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12

Symmetry

if left and right sides of the graph are approximate mirror images

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13

skewed right

if the right side of the graph extends much further out than the left

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14

skewed left

if the left side of the histogram extends much farther out than the right side

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15

unimodial

graph having 1 peak

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16

bimodial

graph having 2 clear peaks

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17

uniform

frequency of each class is relatively the same

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18

bell-shaped

Which shape of distribution is unimodal and symmetrical at the center?

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