When computing descriptive statistics from grouped data
A)data values are treated as if they occur at the midpoint of a class
B)the grouped data result is more accurate than the ungrouped result
C)the grouped data computations are used only when a population is being analyzed
D)all of the above
E)none of the above

Question

Quizplus · Accepted Answer

When computing descriptive statistics from grouped data, it is common practice to treat data values as if they occur at the midpoint of a class. This simplifies calculations and provides a reasonable estimate of measures such as the mean. The grouped data result is not necessarily more accurate than the ungrouped result; in fact, some information is lost when data are grouped. Grouped data computations are not used exclusively for analyzing populations; they can also be used for samples.

When Computing Descriptive Statistics from Grouped Data