After calculating the standard deviation and before collecting complete ... of data within three standard deviations from the mean on a normal distribution (bell curve), as indicated by the ...

The formula for calculating the sample standard deviation, s, is: In the formula, xi represents each data point, the other x represents the mean of the dataset, and n represents the total number ...

The sample formula is used when the data set represents ... while standard deviation reflects how much they vary from the mean. Standard deviation is the square root of the variance and is ...

Standard deviations are important here because the shape of a normal curve is determined by its mean and standard deviation. The mean tells you where the middle, highest part of the curve should go.

An example involving zoo keepers and some very dangerous animals demonstrates that even with the same mean ... to calculate standard deviation using the defining formula is explained.