Stem-and-Leaf Plots
Stem-and-leaf plots are a Grade 7 data display method covered in Big Ideas Math Advanced 2, Chapter 9: Data Analysis and Displays. Each data value is split into a stem (leading digit) and a leaf (trailing digit), with stems listed vertically and leaves arranged in order horizontally. Unlike histograms, stem-and-leaf plots preserve the original data values while showing the overall distribution pattern.
Key Concepts
A stem and leaf plot displays numerical data by separating each data value into a stem (the leading digit(s)) and a leaf (the trailing digit). The stems are listed vertically in order, and the leaves are listed horizontally next to their corresponding stems in ascending order.
Common Questions
What is a stem-and-leaf plot?
A stem-and-leaf plot organizes numerical data by splitting each value into a stem (leading digits) and leaf (last digit). Stems are listed vertically and the corresponding leaves are written beside them in order.
How do you read a stem-and-leaf plot?
Each row represents a stem. Combine each leaf with its row stem to get back the original data value. For example, a stem of 7 and leaf of 8 represents the value 78.
What is the advantage of a stem-and-leaf plot over a histogram?
Stem-and-leaf plots preserve the original data values, allowing you to find the exact values as well as the distribution pattern. Histograms only show frequency counts within intervals.
What textbook covers stem-and-leaf plots in Grade 7?
Big Ideas Math Advanced 2, Chapter 9: Data Analysis and Displays covers stem-and-leaf plots as a method for organizing and analyzing numerical data.