Mean = The sum of the data divided by the number of items in the data set. Median = The middle number in a set of data when the data are arranged in numerical order. Mode = The number of numbers that occur the most often in a set of data. Range = A description of how spread-out the data is. The difference between the largest # and the smallest # in the data. Central tendency = indicate the middle or center of a set of data. Intervals = space between numbers on an axis. The space should be consistent. Data set =simply a group of numbers. Unit 9 Vocabulary (14 words) Slide 1

Venn Diagram = A diagram that uses overlapping circles to show how elements among sets of numbers or objects are related. Bar graph = A graphic form using bars to make comparisons of statistics. Line plot =A diagram that shows the frequency of data. Slide 2

Line graph = A type of statistical graph using lines to show how values change over a period of time. 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. Circle graph = A type of statistical graph used to compare parts of a whole. Slide 3

OUTLIER: a number or couple of numbers that lie away from the main cluster of numbers in a set of data. (An outlier affects the mean the most.) EXAMPLE: Data: 100, 83, 91, 87, 0 ____ is the outlier. Slide 4