Question: A case-control study was performed to study the relationship between the source of drinking water during the prenatal period and congenital malformations. Case mothers were

A case-control study was performed to study the relationship between the source of drinking water during

the prenatal period and congenital malformations. Case mothers were those with malformed infants in a

registry in Australia between 1951 and 1979. Controls were individually matched by hospital, maternal age

( 2 years), and date of birth ( 1 month). The suspected causal agent was groundwater nitrates. Which non-parametric test would be most appropriate to use in this situation? Justify your answer. What would the null and alternative hypotheses be in this situation?

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