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6.34 Prenatal vitamins and Autism: 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). (Schmidt, 2011) Autism Typical Development Total No vitamin Vitamin 143 302 "Total 254 229 483 (a) State appropriate hypotheses to test for independence of use of prenatal vitamins during the three months before pregnancy and autism. O Ho: Pvitamin = Pno vitamin Ha: Pvitamin > Pno vitamin O Ho: Pvitamin = Pno vitamin Ha: Pvitamin Pno vitamin O Ho: Pvitamin = Pno vitamin Ha: Pvitamin * Pno vitamin (b) Complete the hypothesis test and state an appropriate conclusion. What is the value of the test statistic for this test? (Please round to two (Please round