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# Ch. 2 Stats/Graphs

### Mrs. Bullecks Statistics and Graphs

average the sum of two or more quantities divided by the number of quantities; the mean
bar graph a graph using bars to compare quantities. The height or length of each bar represents a designated number
frequency the number of times an item occurs
graph a visual way to display data
horizontal axis the axis on which the categories or values are shown in a bar and line graph.
integers the whole numbers and their opposites.
key a sample data point used to explain the stems and leaves in a stem-and-leaf plot
line graph a graph used to show how a set of data changes over a period of time.
line plot a diagram that shows the frequency of data on a number line
mean the sum of the numbers in a set of data divided by the number of pieces of data
measures of central tendency numbers that are used to describe the center of a set of data. These measures include the mean, median, and mode.
median the middle number in a set of data when the data are arranged in numberical order. If the data has an even number, the median is the mean of the two middle numbers.
mode the number(s) or item(s) that appear most often in a set of data.
negative numbers a number that is less than zero
opposites numbers that are the same distance from zero in opposite directions.
outliers a value that is much higher or much lower than the other values in a set of data
positive numbers a number that is greater than zero
range the difference between the greatest number and the least number in a set of data.
stem-and-leaf plot a system used to condense a set of data where the greatest place value of the data forms the stem and the next greatest place value forms the leaves.
vertical axis the axis on which the scale and interval are shown in a bar or line graph.
Created by: Bullecks