Word  Definition  Examples  

BacktoBack Stem and Leaf Plot  A stemand leaf plot that is used to compare two related sets of data.
In this example, the section on the right is a regular stemandleaf plot for Team A. The Team B data, on the left, uses the same stem and the leafs are written backwards (largest first). 

Bar Graph  A graph where data is shown in bars that are used to compare amounts.
The length of each bar represents the frequency, so taller bars have more. 

Base  In geometry, the base is the surface a solid sits on (the bottom)
In Algebra when you have an expression of the form x^{n}, x is the base and n is the exponent. In number systems, base is the number of digits you have to work with.


Best Fit Line  The straight line that most closely approximates the data in a scatter plot.  
Beta Β β  Greek letter frequently used to represent angles,
especially when two or more angles are shown.
The funny T thing is a gamma γ, the third letter of the Greek alphabet. 

Binomial  Polynomial expression with two terms. Bi means two and poly means many. 

Binomial Experiment  In probability, an experiment that has only two possible outcomes Tossing one coin is a binomial experiment because you only get heads or tails True or false questions are binomial, because they only can be answered T or F 

Binomial Theorem  The expansion of (a + b)^{n} where n is a positive
integer is: (a + b)^{n}= C_{0}a^{n} + C_{1}a^{n1}b^{1 }+ C_{2}a^{n2}b^{2 }+ ... + C_{n1}a^{1}b^{n1 }+ C_{n}b^{n} In English, this means take a simple binomial (two terms) and multiply it by itself one or more times. 
(x + 3)^{2}= (x + 3)(x + 3) = x^{2} + 6x + 9
This is a binomial expansion. 

Bounded intervals  Intervals with defined end points on the real number line used to define the domain of an inequality. See unbounded intervals  [a,b] means a < x < b, a closed interval (a,b) means a < x < b, an open interval [a,b) means a < x < b (a,b] means a < x < b 

Box and Whisker Plot  A diagram that divides a set of data into four parts: lower quartile, below the mean
(average), above the mean, and highest quartile.
It has this name because it sort of looks like a cat with whiskers sticking out. 

Branch  Each piece of a discontinuous
graph where it jumps or has a hole.
A piecewise graph (example shown at right) can have discontiuities. Another graph that might have discontinuities is when you try to divide by zero. 
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