Question: In the 1980s it was generally believed that congenital abnormalities affect 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 abnormality.  Is this strong evidence that the risk has increased?  (We consider P-value of around 5% to represent strong evidence.)

1. Write appropriate hypotheses.
   b) Check the necessary assumptions.
   c) Perform the mechanics of the test. What is the P-value? Draw a sketch of the distribution of the proportions and your test data.  This does not need to be large, but must show the relevant data.
   d) Explain carefully what the P-value means in this context.
   e) What's your conclusion?
   f) Do environmental chemicals cause autism?
   
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   Solution: The downloadable solution consists of 2 pages
   Deliverable: Word Document
   
   
   

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