data

collected information

a graph that uses columns of Xs

above a number line

tally chart

a way to keep track of data using marks to record the number of responses or occurrences.

frequency table

a way of organizing a set of data, showing the number of times each item or number appears

organized data

collected information arranged in a display that is meaningful and assists in the interpretation

of the data

labels (for a graph)

the titles given to a graph, to the axes of a graph, or to the scales on the axes of a graph

a horizontal or vertical number line on a graph

interval

the distance between adjacent numbers

on an axis of a graph

frequency

the number of times a response occurs or something happens

scale

 a. the numeric values assigned to the axes of a

     graph

 b. the ratio of the lengths on a map or scale

     drawing with the actual lengths

pictograph

a graph that compares data by

using picture symbols

bar graph

a graph that compares data by using

 vertical or horizontal bars

double-bar graph

a bar graph that compares 2 related groups of data

line graph

a graph that uses 1 or more line segments

to show changes in data (usually over time)

coordinate grid

or graph

a network of evenly spaced, parallel, horizontal and vertical lines especially designed for locating points, displaying data, or drawing maps

ordered pair

a pair of numbers that gives the location of a point on a coordinate graph or grid

coordinate

1 of 2 numbers in an ordered pair

mean

the quantity that is found by adding the numbers in a set of numbers and dividing their sum by the number of addends; sometimes referred to as the average

median

the middle number in a set of numbers arranged in order from least to greatest.

If the set contains an even number of numbers, the median is the mean of the 2 middle numbers

mode

the number that occurs most often

 in a set of numbers

range

the difference between the greatest and least numbers in a set of numbers