Statistics and Probability CLAST Review Workshop Statistics and Probability 2. Identifying Information in Graphs (skill I D 1)

Identifying Information in Graphs Graphs are used to present data and show relationships between different quantities. Bar Graphs - show how specific quantities compare Line Graphs - useful for showing trends and changes Circle Graphs - show how parts are related to the whole 11/13/2018 Kathy Lyden, Dave Saha

Bar Graphs Student Grades Vertical axis represents frequency of occurrence (number of students who scored a particular score) horizontal axis represents categories (grades) quickly conveys relative number of one grade versus another 1. Nine students earned a B. 2. F occurred least often. 3. More than three times as many students earned a C as those who received an F. Student Grades 11/13/2018 Kathy Lyden, Dave Saha

More on Bar Graphs College Enrollment (in millions) Comparing different sub-populations over a span of categories may be done with different colored bars. Each bar’s length may be given explicitly, as in this example. 1. 1.4 million more men than women were enrolled in college in 1970. 2. Female college enrollment increased by 3.55 million from 1970 to 1990. 6.55 5.85 5.58 5.56 4.4 3.0 11/13/2018 Kathy Lyden, Dave Saha

Line Graphs Show trends, especially comparing trends between categories 1. The North district was the most stable through the year. 2. The East district showed the most change. 11/13/2018 Kathy Lyden, Dave Saha

Circle Graphs (Pie Charts) Show how the parts relate to the whole Division of the graph may be in percentage, as in this example, or in frequency of occurrence. 1. There is more than a 2:1 ratio between divorced women (29%) and single women (13%). 2. Divorced women outnumber married women. Marital Status 11/13/2018 Kathy Lyden, Dave Saha