Variance:
Variance measures the dispersion of a variable about its mean. The formula for calculating variance is the sum of the difference between the observed value and the mean value divided by the sample size.
Given these variances it is wise to test your message across multiple email clients including the free accounts.
Include in this page your target revenue and transaction volume for the year, and broken down by quarter, especially if your product involves seasonal variances.
Canadian open rates are above the US average of 28% (Doubleclick, 2005). According to Canadian marketers their open rates averaged 40% in 2004. The diagram below shows that there is a wide variance in open rates.
 See also: Market, Product, Data, Rough, Research
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