Box plot (box and whisker plot)

a graphical representation showing the five-number summary of data (minimum, lower quartile, median, upper quartile, maximum)

Categorical data

data that represents the attributes of a group of people, events, or objects

Data

information that is collected about people, events, or objects

Dot plot

a graphical representation to organize data that uses dots (or Xs) to show the frequency (number of times) that each number occurs

Histogram

a graphical representation of adjacent bars with different heights or lengths used to represent the frequency of data in certain ranges of continuous and equal intervals

Interquartile range (IQR)

difference between the first quartile and the third quartile of a set of numbers (IQR = Q3 - Q1)

Mean

average of a set of data found by finding the sum of a set of data and dividing the sum by the number of pieces of data in the set

Median

the middle number of a set of data that has been arranged in order from greatest to least or least to greatest

Mode

most frequent piece of data in a set of data

Mode of categorical data (modal category)

most frequent category in a set of data

Mode of numeric data

most frequent value in a set of data

Numerical data

data that represents values or observations that can be measured and placed in ascending or descending order

Percent

a part of a whole expressed in hundredths

Percent bar graph

a graphical representation to organize data that uses solid bars that do not touch each other to show the frequency (number of times) that each category occurs as a percentage as compared to the related part(s) or to the whole

Positive rational numbers

the set of numbers that can be expressed as a fraction , where a and b are counting (natural) numbers

Range

the difference between the greatest number and least number in a set of data

Relative frequency table

a table to organize data that lists categories and the frequency (number of times) that each category occurs as a percentage

Stem-and-leaf plot

a graphical representation used to analyze and compare groups or clusters of numerical data by separating one place value from another place value of a data set. The larger of the two place values is called the stem and the smaller of the two place values is called the leaf.

Variability

measure of the spread of a set of data