In a study of 308,183 cell phone? users, it was found that 30 developed cancer of the brain or nervous system. Assuming that cell phones have no? effect, there is a 0.000138 probability of a person developing cancer of the brain or nervous system. We therefore expect about 43 cases of such cancer in a group of 308,183 people. Estimate the probability of 30 or fewer cases of such cancer in a group of 308,183 people. What do these results suggest about media reports that cell phones cause cancer of the brain or nervous system? P(x less than or equal 30)=

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.