The Difference Between Lists and Data 
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Let's say we have created two parameters:
$p1 = list(2,4,6,8,11,15,20,22) $p2 = data(2,4,6,8,11,15,20,22)
What's the difference?
Lists are designed for situations where you normally need to use ONE possible value from a list of values. Data is designed for situations where you normally use ALL of the values at the same time.
The most obvious use of a data parameter is to hold a set of data that you are going to perform statistical calculations on.
Using data and list parameters is subtly different.
If I include $p1 in an equation or calculation, it will be replaced by ONE, randomly chosen value. If I include $p2 in an equation or calculation, it will always be replaced by the ALL of the values in the parameter.
The effect is particularly obvious when used with the calculator.
