Question
Study of 420,076 cell phone users found that 133 of them developed cancer of the brain or nervous system Prior to this study of cell phone use the rate 0f such cancer was Tound t0 be 032996 for those not using ce phones Complete parts and Use the sample data t0 construct 95%6 confidence interval estimate of the percentage of cell phone users who develop cancer of the brain Or nervous system l% < p < Round t0 three decimal places as needed _
study of 420,076 cell phone users found that 133 of them developed cancer of the brain or nervous system Prior to this study of cell phone use the rate 0f such cancer was Tound t0 be 032996 for those not using ce phones Complete parts and Use the sample data t0 construct 95%6 confidence interval estimate of the percentage of cell phone users who develop cancer of the brain Or nervous system l% < p < Round t0 three decimal places as needed _
Answers
One study of cell phones and the risk of brain cancer looked at a group of 469 people who have brain cancer. The investigators matched each cancer patient with a person of the same age, gender, and race who did not have brain cancer, then asked about the use of cell phones. Result: “Our data suggest that the use of handheld cellular phones is not associated with risk of brain cancer.” $^{32}$
(a) Is this an observational study or an experiment? Justify your answer.
(b) Based on this study, would you conclude that cell phones do not increase the risk of brain cancer? Why or why not?
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