L How to construct a Frequency distribution 1. Number of classes Choose an approximate number of classes for your data Sturges rule can help 2. Estimate the class interval Divide the approximate number of classes(from Step 1)into the range of your data to find the approximate class interval, where the range is defined as the largest data value minus the smallest data value 3. Determine the class interval Round the estimate(from Step 2)to a convenient value C 2002 The Wadsworth GroupHow to Construct a Frequency Distribution 1. Number of classes Choose an approximate number of classes for your data. Sturges’ rule can help. 2. Estimate the class interval Divide the approximate number of classes (from Step 1) into the range of your data to find the approximate class interval, where the range is defined as the largest data value minus the smallest data value. 3. Determine the class interval Round the estimate (from Step 2) to a convenient value. © 2002 The Wadsworth Group