Averages and Indexes Differ from One Another in That an Index

Multiple Choice

Averages and indexes differ from one another in that an index

A) is the arithmetic average price behavior of a group of stocks at a given point in time.
B) measures the current price behavior of a group of stocks in relation to a base value set at an earlier point in time.
C) is of value in-and-of itself, whereas an average must be compared to a historical figure to have any meaning.
D) always moves up before a corresponding average moves up, and always moves down before a corresponding average moves down.