Data falling outside three standard deviations ... Many naturally occurring phenomena appear to be normally distributed. For example, the average height of a human is roughly 175 cm (5' 9 ...

This distribution of data points is called the normal or bell curve distribution. For example, in a group of 100 individuals, 10 may be below 5 feet tall, 65 may stand between 5 and 5.5 feet and ...

This wonderfully animated applet helps users understand the sample mean's properties, using simulated fish length data which is assumed to come from a normal distribution. Users can choose the sample ...

A useful theorem in statistics, *The Central Limit Theorem, states that sums and averages tend to follow a normal distribution, no matter what distribution the individual data values come from. For a ...

This example considers a data set given in Lawless (1982 ... The following code computes confidence intervals based on the asymptotic normal distribution. These will be compared with the ...