A Consumer Group Is Performing an Experiment to Evaluate the Tartar-Fightingproperties

question 16

Essay

A consumer group is performing an experiment to evaluate the tartar-fightingproperties of different brands of toothpaste. Three brands of toothpaste are beingcompared in a randomized comparative experiment. (There is no "do-not-brush"control group.) 300 adult volunteers of varying ages (100 for each toothpaste brand)have been randomly assigned to the treatments. The toothpaste for each brand isdelivered in containers that are the same except for the letters, X, Y, and Zprominently displayed. A team of dentists, blind to the identities of the toothpastebrands, will evaluate the levels of tartar on the subjects' teeth after 2 months of use.The subjects have been instructed to brush their teeth as they normally do during thecourse of the experiment.(a) What is the explanatory variable (factor) for this experiment?
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b) What is the response variable for this experiment?
(c) After the onset of the experiment, it was discovered that a significant number ofvolunteers using Brand Y toothpaste recently enrolled in a short class on healthpractices, and one of the lessons involved instruction in effective brushing techniques.If none of the volunteers using Brands X and Z enrolled in the class, how would thisaffect the consumer group's interpretation of the results of the experiment?

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Definitions:

Pitta

In Ayurveda, one of the three doshas or constitutions, characterized by heat and energy, and often associated with metabolism and digestion.

Kapha

In Ayurvedic medicine, one of the three doshas or body types, represented by elements of earth and water and associated with strength and stability.

Yoga

A disciplined method for attaining a goal, including physical postures, breathing techniques, and meditation for health and relaxation.

Breath Control

The practice of consciously regulating one's breathing patterns, often used in meditation, singing, or swimming.