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Statistics: Informed Decisions Using Data | 4th Edition | ISBN: 9780321757272 | Authors: Michael Sullivan, III
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Whiter Teeth An ad for Crest Whitestrips Premium claims

Chapter 1, Problem 11E

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QUESTION:

Problem 11E

Whiter Teeth An ad for Crest Whitestrips Premium claims that the strips will whiten teeth in 7 days and the results will last for 12 months. A researcher who wishes to test this claim studies 20 sets of identical twins. Within each set of twins, one is randomly selected to use Crest Whitestrips Premium in addition to regular brushing and flossing, while the other just brushes and flosses. Whiteness of teeth is measured at the beginning of the study, after 7 days, and every month thereafter for 12 months.

(a) What type of experimental design is this?

(b) What is the response variable in this experiment?

(c) What are the treatments?

(d) What are other factors (controlled or uncontrolled) that could affect the response variable?

(e) What might be an advantage of using identical twins as subjects in this experiment?

Questions & Answers

QUESTION:

Problem 11E

Whiter Teeth An ad for Crest Whitestrips Premium claims that the strips will whiten teeth in 7 days and the results will last for 12 months. A researcher who wishes to test this claim studies 20 sets of identical twins. Within each set of twins, one is randomly selected to use Crest Whitestrips Premium in addition to regular brushing and flossing, while the other just brushes and flosses. Whiteness of teeth is measured at the beginning of the study, after 7 days, and every month thereafter for 12 months.

(a) What type of experimental design is this?

(b) What is the response variable in this experiment?

(c) What are the treatments?

(d) What are other factors (controlled or uncontrolled) that could affect the response variable?

(e) What might be an advantage of using identical twins as subjects in this experiment?

ANSWER:

Solution:

Step 1 of 5:

  1. We have to check the type of experimental design.

A matched-pairs design is an experimental design in which the experimental units are paired up. In matched-pairs design, one matched individual will receive one treatment and the other receives a different treatment.

Hene, it is a matched pair design.

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