In a genetic study of chromosome structures, 132 individuals are classified according to the type of structural chromosome aberration and carriers in their parents. The following counts are obtained.

Test the null hypothesis that type of aberration is independent of parental carrier.
Analyze the data to determine if the changes in coronary blockage were significantly different between the two groups of patients

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Type of Presumably Substantially36 Carrier Aberration One Parent Neither Parent Tota 47 85 132 27 20 Innocuous 49 Unbalanced Total 63 69