3rd Grade Unit Two

Terms	Definitions
Bar Graph	a graph that uses the height, or length of rectangles to compare data.
Categories	a collection of things sharing a common attribute
compare	examine and note the similarities or differences between two or more objects, problems, numbers, etc...
Centimeter	a metric unit of length equal to .01 (1/100), one one-hundredth of a meter. 100 of these in a meter
certain event	Something that will definitely happen. An event that has a probability of 1. If you have a bag filled with green marbles, picking a green marble will definitely happen.
data	information, especially numerical information
Double Bar Graph	in a double bar graph, there are two sets of data or two bars for each item
Distance	size of the gap or space between two places
equally Likely	Having the same chance or probability. 4 white marbles and 4 blue marbles in a bag creates the same chance of drawing a blue or white marble.
equivalent units	comparing the value of two more unit measurements to find equal values. 100 centimeters = 1 meter
Foot	customary unit of length equal to 12 inches (ft)
Feet	plural of foot, more than one foot. (ft)
graph	a drawing that shows a relationship between sets of data.
pictograph	a graph that uses pictures to show and compare information
interval	The distance between two numbers on the scale of a graph
impossible event	an event with a probabilty of zero (0). An event that cannot happen. If you have a bag filled with green and blue marbles, there is zero probability that you will draw a red marble.
inch	a customary unit of length equal to 1/12 of a foot. There are 12 of these in one foot.
graph key	a list which explains the symbols on a graph For example: $=100 dollars $$= 200 dollars
length	one dimension of a 2-or 3-dimensional figure
line plot	a graph showing frequency of data on a number line X X X X X X X X X 40----41----42------43-----44-----45------46
mode	the number that appears most frequently in a set of numbers. There may be one, more than one, or no mode.
median	The middle number when numbers are arranged from least to greatest. The median of 3, 4, 7, 9 and 10 is 7. When the set has two middle numbers, the median is the mean of the two middle numbers.
metric system	a system of measurement based on tens. The basic unit of length is the meter. The basic unit of mass is the gram. The basic unit of capacity is the liter.
measure	a comparison to some other known unit, or to find the measure of something
outlier	Any data point that sticks out. NOT all data sets have one.
outcome	one of the possible things that can happen in a probability experiment or problem.
possible	something that can be done, something that can happen
probability	the chance of an event happening.
range	the difference between the greatest number and the least number in a set of numbers (data). The range of the numbers 5,9,8,2,and 6 is 7 9-2=7
record	make a record of, to write down, type up, save as an audio fil-e
scale	an instrument used for weighting
scale (on a map)	a statement or diagram that tells the actual distance represented by a distance on a map. For example: 1 inch on the map = 100 miles on the road
scale (on a graph)	the numbers along the axes of the graph.
sample space	A list of all of the outcomes
survey	the process of asking a group of people the same question. For example: Do you like ice cream?
table	an organized way to list data. Tables usually have rows and columns of data.
tally marks	marks made to keep track of things being counted.
U.S. customary system	a system of measurement used in the U.S. The system includes units for measuring length, capacity, weight, and temperature. Feet, ounces, and gallons are examples of customary units of measurement.
Yard	a customary unit of length equal to 3 feet.