Normal Distribution
The normal distribution is a symmetrical bell-shaped statistical distribution of data where the mean, the median and the mode all have the same value.
A lot of statistical methods in market research require that the variables are normally distributed within the basic population. Therefore it needs to be checked in advance whether such a normal distribution applies. Often an approximate normal distribution is sufficient to apply a certain type of analysis.
An example for an approximate normal distribution is the body height of men and women: there are only a few very tall, a few very short but a lot of persons with medium body height.
See also:
Mean
Statistical methods
Basic population
