A health food store owner wants to know if eating natural foods is a contributing factor to healthier teeth. The owner selected a random sample of 50 customers between 65-70 years old, 25 of whom ate natural foods daily throughout their lives and 25 of whom did not eat natural foods daily throughout their lives. The researchers measured the condition of each participant's teeth. Which of the following is TRUE? A) This is an example of a prospective study. B) This is an example of a randomized experiment. C) The researchers used systematic random sampling. D) This is an example of a retrospective study. E) The researchers used cluster random sampling.
A health food store owner wants to know if eating natural foods is a contributing factor to healthier teeth. The owner selected a random sample of 50 customers between 65-70 years old, 25 of whom ate natural foods daily throughout their lives and 25 of whom did not eat natural foods daily throughout their lives. The researchers measured the condition of each participant's teeth. Which of the following is TRUE? A) This is an example of a prospective study. B) This is an example of a randomized experiment. C) The researchers used systematic random sampling. D) This is an example of a retrospective study. E) The researchers used cluster random sampling.
Calculus For The Life Sciences
2nd Edition
ISBN:9780321964038
Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.
Chapter10: Matrices
Section10.EA: Extended Application Contagion
Problem 2EA
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Transcribed Image Text:3. A health food store owner wants to know if eating natural foods is a contributing factor to healthier
teeth. The owner selected a random sample of 50 customers between 65-70 years old, 25 of whom
ate natural foods daily throughout their lives and 25 of whom did not eat natural foods daily
throughout their lives. The researchers measured the condition of each participant's teeth. Which of
the following is TRUE?
A) This is an example of a prospective study.
B) This is an example of a randomized experiment.
C) The researchers used systematic random sampling.
D) This is an example of a retrospective study.
E) The researchers used cluster random sampling.
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