In the 1980s, it was generally believed that congenital abnormalities affected about 5 % of the nation’s children. Some people believe that the increase in the number of chemicals in the environment has led to an increase in the incidence of abnormalities. A recent study examined 384 children and found that 46 of them showed signs of an abnormality. Is this strong evidence that the risk has increased? (We consider a P-value of around 5% to represent reasonable evidence.),a) Write appropriate hypotheses.,b) Check the necessary assumptions.,c) Perform the mechanics of the test. What is the P-value?,d) Explain carefully what the P-value means in this context.,e) What’s your conclusion?,f) Do chemicals in the environment cause congenital abnormalities?
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