Researchers studying the link between prenatal vitamin use and autism surveyed the mothers of a random sample of children aged 24 - 60 months with autism and conducted another separate random sample for children with typical development. The table below shows the number of mothers in each group who did and did not use prenatal vitamins during the three months before pregnancy (periconceptional period).

(a) State appropriate hypotheses to test for independence of use of prenatal vitamins during the three months before pregnancy and autism. 

(b) Complete the hypothesis test and state an appropriate conclusion. 

(c) A New York Times article reporting on this study was titled "Prenatal Vitamins May Ward Off Autism". Do you find the title of this article to be appropriate? Explain your answer. Additionally, propose an alternative title.

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Periconceptional prenatal vitamin Vitamin Total No vitamin Autism Autism Typical development 111 143 254 70 159 229 Total 181 302 483