Chapter 22

Question	Answer
Mean	Statistical term that is found by: Sum of all figures ÷ Number of figures, 574–575.
Weighted mean	Used to find an average when values appear more than once, 574.
Median	Statistical term that represents the central point or midpoint of a series of numbers, 575–576.
Mode	Value that occurs most often in a series of numbers, 576.
Frequency distribution	Shows by table the number of times event(s) occurs, 577.
Bar graph	Visual representation using horizontal or vertical bars to make comparison or to show relationship on items of similar makeup, 578–580.
Line graph	Graphical presentation that involves a time element. Shows trends, failures, backlogs, and the like, 580.
Circle graphs	A visual representation of the parts to the whole, 581–582.
Index numbers	Express the relative changes in a variable compared with some base, which is taken as 100, 582–583.
Price relative	The quotient of the current price divided by some previous year’s price—the base year—multiplied by 100, 582.
Measure of dispersion	Number that describes how the numbers of a set of data are spread out or dispersed, 584–586.
Range	Difference between the highest and lowest values in a group of values or set of data, 584.
Standard deviation	Measures the spread of data around the mean, 584–585.
Normal distribution	Data are spread symmetrically about the mean, 585–586.
Empirical Rule	For a normal distribution, nearly all the data fall within three standard deviations of the mean, 586.

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