An obstetrician wants to learn whether the amount of prenatal care and the wante

Question

An obstetrician wants to learn whether the amount of prenatal care and the wantedness of the pregnancy are associated. He randomly select 939 women who had given birth and asked them to determine if their pregnancy was intended, unintended, or mistimed. In addition, they were asked to disclose when they started receiving prenatal care, if ever. The results are summarized in the table below: The obstetrician wishes to perform a chi-square test of independence to test the hypotheses: H_0: Wantedness and amount of prenatal care are independent. H_1: Wantedness and amount of prenatal care are dependent. What are the degrees of freedom for this test?

Explanation / Answer

what are the degrees of fredom fo rthe test

Degrees of fredom=n-1

                             =939-1

                             =938

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