When the experimenter manipulates the probability of attention for slapping, frequency of slapping is an example of the

dependent variable

Explanation:

The dependent variables is being studied or measured in the experiment or in the study. A dependent variable is a variable that is dependent on another variable in the experiment. It is the effect. When the independent variable changes, the values of the dependent variable also changes.

Thus in the context, when the experimenter manipulates the probability of the attention for slapping, the frequency of the slapping is the example of a dependent variable.  

which of the following is a subsurface event that takes place during the rock cycle?

answer; the government can clearly justify the restriction;