Suppose that 13 deaths have occurred among 55-64 year-old male workers in a nuclear-power plant and that in 5 of them the cause of death was cancer. Assume, based on vital-statistics reports, that approximately 20% of all deaths can be attributed to some form of cancer. Is there evidence that the proportion of deaths from cancer in nuclear-power plant workers is greater than the proportion of deaths from cancer in men of comparable age in the general population? What will be the hypothesis?

Ho: the proportion of cancer deaths caused by radiation exposure <.20

Ha: proportion of cancer deaths caused by rafiation exposure >.20