Most of the statistical analyses presented in
this book are based on the bell-shaped
or normal distribution. The introductory
section defines what
it means for a distribution to be normal and presents some important
properties of normal distributions. The interesting
history of
the discovery of the normal distribution is described in the
second section. Methods for calculating probabilities based on
the normal distribution are described in Areas
of Normal Distributions. The Varieties
of Normal Distribution Demo allows you to enter values for
the mean and standard deviation of a normal distribution and
see a graph of the resulting distribution. A frequently used
normal distribution is called the Standard
Normal distribution and is described in the section with
that name. The binomial distribution can be approximated by a
normal distribution. The section Normal
Approximation to the Binomial shows this approximation. The Normal
Approximation Demo allows you to explore the accuracy of
this approximation.