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Your textbook describes a number of e-business models. A membership model is one where vendors ask partners to place logos or banner ads on their sites. If customers click the logo, go to vendor's site, and buy something, the vendor pays a commission to partners.
Standard Normal Variable
A standard normal variable is a random variable that follows a normal distribution with a mean of zero and a standard deviation of one.
Standard Normal Distribution
A normal distribution with a mean of 0 and a standard deviation of 1, serving as a basis for comparison for other distributions.
Mean
The arithmetic average of a set of values, calculated by adding all the values together and dividing by the number of values.
Standard Deviation
A measure of the amount of variation or dispersion of a set of values; a low standard deviation means the values are close to the mean, while a high standard deviation means the values are dispersed over a wider range.
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