Bob has a severe cold.His roommate takes a garlic tablet every morning and has not had a cold in 2 years.Bob's aunt also has a friend who takes garlic tablets daily and has not had a cold in more than a year.Based on these data,Bob decides to start taking garlic tablets as soon as his cold clears up.What type of study is Bob's decision based on?
A) Anecdotal evidence
B) An observational study based on available data
C) An observational study that is a sample survey
D) An experiment
Correct Answer:
Verified
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