Reuters (June 24, 1997) reported on a study published in the Journal of the Amer

Question

Reuters (June 24, 1997) reported on a study published in the Journal of the American Medical Association (1997, vol. 277, pp. 1940–1944) in which researchers recruited 276 volunteers (aged 18 to 55) and used nose drops to infect them with a cold virus. The volunteers were then quarantined and observed to see whether they came down with a cold or infection. They also answered questions about their social lives, including the number of different types of contacts they had (family, work, community, religious groups, and so on). Reuters reported that “those with one to three types of social contacts were 4.2 times as likely to come down with cold symptoms and signs of infection compared to those with six or more contacts.”

Is this an observational study or an experiment? Select one.

A)Observational study because number of types of social contacts was not randomly assigned.

B)Observational study because the sample is from volunteers.

C)Observational study because researchers observed whether the volunteers came down with a cold or not.

D)Experiment because the researchers used nose drops to infect volunteers. Not this one :)

Explanation / Answer

Observational study because researchers observed whether the volunteers came down with a cold or not.

Option C is correct.

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