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 the study an observational study or an experiment? Observational study because researchers observed whether the volunteers came down with a cold or not. Observational study because the sample is from volunteers. Observational study because number of types of social contacts was not randomly assigned. Experiment because the researchers used nose drops to infect the volunteers. Identify the explanatory and response variable. 1. Number of difference types of contacts 2. Whether they got a cold 3. Age 4. How likely they were to get a cold

Explanation / Answer

Question 6: Experiment because the researchers used nose drops to infect the volunteers

Question 7: Response Variable: Whether they got a cold.
Explanatory Variable: Number of difference types of contacts

Related Questions

Navigate

• Browse (All)
• Browse R
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.