In a study of 420,019 cell phone users, 172 of the subjects developed brain cancer. Test the claim that cell phone users developed brain cancer at a greater rate than that for non-cell phone users (the rate of brain cancer for non-cell phone users is 0.0340%). Since this is a critical issue, use a 0.005 significance level. Explain why the significance level should be so low in terms of a Type I error.

mean = 172

sampl size = 420019

significance lvl = 0.500%

null hyp: P > 0.0340%

alt hyp: P < 0.0340%

Calculate Critical value, Test Statistic, and P-value using excel