Answer :
The definition of Alternative Hypothesis is the variable being manipulated. Thus, option "D" is correct.
What is the independent variable?
The independent variable is a variable whose value is independent of the value of another variable. The dependent variable is a variable whose value is determined by the value of another variable.
The independent variable is the factor that is changed or manipulated; the dependent variable is the factor that depends on the independent variable.
Thus, option "D" is correct.
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