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1. variable is an antecedent 2. random assignment 3. values are maniipulated 4. controls
Should be rigidly defined based on all values Easy understood and calculated Least affected by the fluctuations of sampling
It depends on the domain of y. If that is restricted to non-negative values, then the answer is yes. But if y is allowed to be negative, then the answer is no because then there are two values of y for each non-zero value of x.
Datum is the singular form of the word data in computer terminology. It also is defined as a set of values to define a specific geodetic system. The plural of this word, however, is datums.
The domain is anything you want it to be. You could define the domain to be integer values only, or it could be {-3, -2.5, .2, 0, sqrt(7), 9}.