Define the following terms. (a) Experimental unit (d) Factor (b) Treatment (e) Placebo (c) Response variable (f) Confounding

(a) Experimental unit

A person or an object, or some well-defined body or item on which some treatment is applied

(b) Treatment

Combination of a values of factors . These are explanatory variables.

(c) Response variable

The qualitative variable or quantitative variable in which the researcher wants to determine how the value is affected by any explanatory variable.

(d) Factor

It is the variable whose influence on a response variable can be assessed by the researcher.

(e) Placebo

An innocuous treatment, like a sugar tablet, which looks, smells and tastes like an experimental medication.

(f) Confounding

The effect of the two factors cannot be distinguished.