Some scientists are concerned that electromagnetic radiation

Some scientists are concerned that electromagnetic radiation - GED Prep

Question

Some scientists are concerned that electromagnetic radiation transmitted from cellular phones may be harmful to humans.

A group of scientists (Hardell et al., 2013) concerned about electromagnetic radiation from cellular phones studied 593 frequent cell phone users and 1,3 was compiled by a survey that asked people about their cell phone usage and cancer rates over time. The study found that brain tumors were more prevalent in frequent cell phone users and were more common on the side of the head that the cell phone user held the phone to.

Another group of scientists (Schüz et al., 2006) published results from a study of 420,000 Danish citizens. The study followed some of its subjects for many years-including people who started using cell phones from 1982 to 1995-and stopped monitoring in 2002. The study showed no increase in cancer rate of cell phone use.

Based on the information above, which group's conclusion about a potential link between cell phone use and cancer is more likely to be correct and why?

Answers

The Schüz group followed some people for only 7 years (1995-2002), so the Schüz group is less likely to be correct.
The Hardell group specifically divided cell phone users into frequent users and nonusers to reach its conclusions, so the Hardell group is less likely.
The Hardell group found a link between the side of the head the cell phone is used on and brain tumor locations, so the Hardell group is more likeley.
correct

The Schüz group followed some people for more than 20 years and recorded data rather than relying on self-reporting, so the Schüz group is more correct.

Explanation

The correct answer is: The Schüz group followed some people for more than 20 years and recorded data rather than relying on self-reporting, so the Schüz group is more likely to be correct.

The Schüz study is more reliable due to its larger sample size (420,000 vs. 593), longer duration (up to 20+ years vs. unspecified), and objective data collection methods. These factors reduce bias and increase statistical power. The Hardell study's reliance on self-reporting introduces potential recall bias. Long-term, large-scale studies with objective measures generally provide more accurate results in epidemiological research, making the Schüz group's conclusion more credible.

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