A cereal manufacturer seeks to test their newest product against a competitor's. A group of 100 children was asked to evaluate each brand, and then to express a preference. To guard against bias, neither the children, nor the technicians serving them, were aware of the order in which they were fed each brand.

I. What is the population?

II. What is the sample?

III. Is the study observational or experimental? Justify your answer

IV. If observational, identify ALL variables.

If experimental, identify ALL independent and dependent variables.