The type of graph depends on the type of data.Categoric data (such as blood group or species) and discrete data (whole numbers, such as number of petals) are shown on a bar chart. The bars are the same width and are separated by gaps.Continuous data that have been grouped into classes (such as height in 5 cm intervals) are shown on a histogram. There are no gaps between the bars because the data are continuous.On a histogram the frequency (number of individuals) is on the y-axis and the classes are on the x-axis. The shape of a histogram shows how the data are distributed, for example whether they form a normal distribution.
The modal class is the class with the highest frequency, shown by the tallest bar.Characteristics that show discontinuous variation, such as blood group, give a bar chart. Characteristics that show continuous variation, such as mass, give a histogram.
The modal class is the class with the highest frequency, shown by the tallest bar.Characteristics that show discontinuous variation, such as blood group, give a bar chart. Characteristics that show continuous variation, such as mass, give a histogram.