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Lab 8: Standard Deviation Last Modified 02/15/2009 Key Concepts: for loops In this lab, we're going to write a program to computer an important statistic, standard deviation. Specifically, we're going to look at the sample standard deviation , which is a measure of the spread of a sample of data points. A sample refers to a "small" set of data selected to represent the entire population of data we're studying. (By the way, this is in contrast to the population standard deviation, which uses all of the possible available data and has n in the denominator of the formula and uses the population mean instead of the sample mean.) The sample standard deviation, denoted s , of a set of observations { x 1 , x 2 , ..., x n }, is given by In this formula, the variables are: s = the sample standard deviation n = the sample size, i.e. the number of observations (data points) in the sample x i represent the individual data points = the sample mean, i.e. the average of all of the data points in the sample

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