Zara Coffey

Mathematics

22 July, 07:10

Identify the explanatory variable and response variable in each of the studies

described here.

a. A study of cell phone use and primary brain cancer suggested that cell

phone use was not associated with an elevated risk of brain cancer.

b. Records of more than three-quarters of a million surgical procedures

conducted at 34 different hospitals were monitored for anesthetics

safety. The study found a mortality rate of 3.4% for one particular

anesthetic. No other major anesthetics were associated with mortality

greater than 1.9%.

c. In a landmark study involving more than three-quarters of a million

individuals in the United States, Canada, and Finland, subjects were

randomly given either the Salk polio vaccine or a saline (placebo)

injection. The vaccinated group experienced a polio rate of 28 per

100,000 while the placebo group had a rate of 69 per 100,000. A

third group