This preview shows page 1. Sign up to view the full content.
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
histogram, but the vertical scale should be marked with relative frequencies instead of
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 04/17/2008 for the course MATH unknown taught by Professor Sapko during the Fall '08 term at Mass Colleges.
 Fall '08
 Sapko
 Statistics, Histograms

Click to edit the document details