Final answer:
Class width in a frequency distribution table is the range of values within each class interval, determined by subtracting consecutive lower-class boundaries. Conventions vary for including data on boundaries, but typically right boundaries are included except for the left boundary of the first interval.
Step-by-step explanation:
The class width in a frequency distribution table refers to the range of values contained within each interval or class of the table. To find the class width, you typically subtract the lower boundary of one interval from the lower boundary of the next interval. In some cases, like when data values fall on the class boundaries, conventions may vary so that values at the left boundary might not be included in the interval but those on the right boundary are, with the exception of the first interval. In particular scenarios, this can be adjusted to prevent a value from falling on a boundary. For example, rounding up the class width to the next whole number is a strategy that some researchers use.
In the process of setting up a frequency distribution table, organizing and summarizing data in histograms, special attention must be given to the width and boundaries of each class interval for accurate representation and analysis.