The is controlled by the experimenter, while the represents the information collected and statistically analyzed by the experimenter.
dependent variable; independent variable
independent variable; dependent variable
placebo effect; experimenter bias
experiment bias; placebo effect

independent variable; dependent variable

Explanation:

A variable can be defined as classification or measurement, variable quantity, operational concept that expresses values, aspect, property, or factor, that can be distinguished in an object examined and that is susceptible to measurement.  The variables of a scientific research may be independent dependents.

An independent variable is controlled by the experimenter. This variable can be characterized as the variable that influences, determines or affects another variable. It is the element that undergoes manipulation by the researcher when establishing the relationship of the factor with the observed phenomenon, to verify if it affects the other variables, interferes with them or influences the possible results of the work.  It is a condition, or cause, for a particular effect or consequence. In an experimental research, it is the variable manipulated by the researcher to verify what influence it has on a possible result. The independent variable may also be called the experimental or treatment variable.

The dependent variable represents the information collected and statistically analyzed by the experimenter. This variable is the element that will be analyzed and explained as a consequence of the influence it suffers from other variables, ie, it is the factor that varies as the researcher modifies the independent variable.  It can be considered as the factor or property that is the effect, result, consequence or response of something that has been stimulated. It is the observed effect as a result of manipulating the independent variable.  The dependent variable changes due to the change in the independent variable. It can be explained as value or fact, considered as effect in certain hypotheses. It is also called the criterion variable.

answer; overt behavior;

taking a bath requires the most water out of the given options because it takes a significant amount of water in order to fill a bathtub.