091107
Introduction To Statistics
Notes Ch. 23

histograms
are very important graphs that depict the nature of distributions
be able to look at a histogram and be able to understand the nature of the distribution of
the data
to construct a histogram, you must first construct a frequency distribution table
on horizontal scale, each bar is marked with its lower class boundary at the left and its
upper class boundary at the right
more practical to use class midpoint values centered below their corresponding bars than
to use class boundaries along the horizontal scale
horizontal scale: use class boundaries or class midpoints
vertical scale: use class frequencies
maximum frequency should suggest a value for the top of the vertical scale (bottom being
zero)
horizontal scale should be subdivided in a way that allows all the classes to fit well
a
relative frequency histogram
should have the same shape and horizontal scale as a
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 Fall '08
 Sapko
 Statistics, Histograms, Frequency, Histogram, relative frequency histogram, horizontal scale, relative frequency histogram, distr ibutions

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