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Research Question: Is the proportion of all former members of the United States military who have...

Research Question: Is the proportion of all former members of the United States military who have symptoms of PTSD (post dramatic stress disorder) less than 1/4? To help answer this research question, a random sample of n = 1, 000 former members of the United States military is taken and 220 have symptoms of PTSD.

Define the null and alternative hypotheses. What is the sample statistic? What is the test statistic?

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