The standard deviation is a measure of variability.

Which of the following statements is false?

A) When constructing a frequency distribution for categorical data, it will always be necessary to develop class boundaries.
B) It is often a good idea to convert frequency distributions to relative frequency distributions when you compare two distributions with different amount of data.
C) A pie is the familiar circular graph that shows how the measurements are distributed among the categories of a qualitative variable.
D) None of these.
E) All of these.