3. In the early 1900s a dentist in Colorado was investigating the cause of brown spots found on teeth in patients. In his research he observed data that indicated these brown- stained teeth had increased levels of fluoride. Despite the unfavorable views of the brown stains, he also noted a positive aspect-these patients had significantly decreased occurrences of tooth decay and cavities. Is this research sufficient to conclude that fluoride prevents cavities? Explain why or why not.

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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3. In the early 1900s a dentist in Colorado was investigating the cause of brown spots
found on teeth in patients. In his research he observed data that indicated these brown-
stained teeth had increased levels of fluoride. Despite the unfavorable views of the
brown stains, he also noted a positive aspect-these patients had significantly
decreased occurrences of tooth decay and cavities. Is this research sufficient to
conclude that fluoride prevents cavities? Explain why or why not.
4. You would like to perform an experiment on the effectiveness of extra-fluoride toothpaste
on students aged 5-14 who have early-stage tooth decay. Assume the extra fluoride
toothpaste has already been proven to be safe for children to use.
a. What are some possible confounding variables to consider for this experiment?
b. Explain how randomization and control can help you reduce possible bias
created from the variables mentioned above:
Transcribed Image Text:3. In the early 1900s a dentist in Colorado was investigating the cause of brown spots found on teeth in patients. In his research he observed data that indicated these brown- stained teeth had increased levels of fluoride. Despite the unfavorable views of the brown stains, he also noted a positive aspect-these patients had significantly decreased occurrences of tooth decay and cavities. Is this research sufficient to conclude that fluoride prevents cavities? Explain why or why not. 4. You would like to perform an experiment on the effectiveness of extra-fluoride toothpaste on students aged 5-14 who have early-stage tooth decay. Assume the extra fluoride toothpaste has already been proven to be safe for children to use. a. What are some possible confounding variables to consider for this experiment? b. Explain how randomization and control can help you reduce possible bias created from the variables mentioned above:
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