Year 7

Stem and Leaf Plots A Stem and Leaf Plot is a type of graph that is similar to a histogram but shows more information. The Stem-and-Leaf Plot summarizes the shape of a set of data (the distribution) and provides extra detail regarding individual values. The data is arranged by place value. The digits in the largest place is referred to as the stem and the digits in the smallest place are referred to as the leaf (leaves).

Stem and Leaf Plots  What Are They Used For? They are usually used when there are large amounts of numbers to analyse. Series of scores on sports teams, series of temperatures or rainfall over a period of time, series of classroom test scores are examples of when Stem and Leaf Plots could be used.

Stem and Leaf Plots The Stem shows the 'tens' and the leaf. At a glance, one can see that 4 students got a mark in the 90s on their test out of 100. Two students received the same mark of 92. No marks were received below 50. No mark of 100 was received. When you count the total amount of leaves, you know how many students took the test. The information is nicely organised when a Stem and Leaf Plot is used. Stem and Leaf Plots provide an 'at a glance' tool for specific information in large sets of data, otherwise one would have a long list of marks to sift through and analyse. StemLeaf

Dot plot A dot chart or dot plot is a statistical chart consisting of group of data points plotted on a simple scale. Dot plots are used for small to moderate quantities of continuous data. Continuous data - Data that can take any value (within a range). Example: People's heights could be any value (within the range of human heights), not just certain fixed heights. (Opposite of Discrete Data)

Dot plot Test scores

Scatter plot A graph of plotted points that show the relationship between two sets of data. In this example, each dot represents one person's weight versus their height.