Final answer:
In a histogram, 'Class' represents a range of data grouped into intervals and each bar's height indicates the frequency of data points within that class. The setup can vary, with some counting values on right boundaries as part of the class, except for the first interval.
Step-by-step explanation:
"Class" in the context of a histogram refers to the range of data that is grouped into intervals. Each class represents a certain range of values and the frequency of how many data points fall within that range. Each bar in a histogram represents a class; the height of the bar indicates the frequency of the data points within that class. A frequency table might be used to organize data into classes, showing the alignment of grouped data with their corresponding frequencies.
Constructing a histogram involves setting up bins or classes of uniform width, which are used to group the data. The term 'class' can also be called 'bin' or 'interval.' When setting up these intervals, it's important to be consistent, especially regarding whether to include data points that fall on the boundaries.
Some histograms count the data values that fall on the right boundary as part of the class interval, except for the first interval where values on both boundaries are included. However, there is more than one correct way to set up a histogram and different methods can be used based on the researcher's preference.