The percentage distribution of birth weights for all children in cases of multiple births (twins, triplets, etc.) in North Carolina during 2009 was as given in the following table:
The frequency distribution of birth weights of a sample of 587 children who shared multiple births and were born in North Carolina in 2012 is as shown in the following table:
Test at a 2.5% significance level whether the 2012 distribution of birth weights for all children born in North Carolina who shared multiple births is significantly different from the one for 2009.
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