This is a multivariate contingency analysis question pertaining to a zero table referendum.

A researcher hypothesizes that parents with school-aged children are more likely to vote in favor of a referendum increasing public school spending than adults without school aged-children, but wonders if this relationship holds true for both Democrats and Republicans.

School Referendum = Democrats Democrats
No children With Children
Voted Yes= 40 Voted Yes= 45
Voted No= 10 Voted No= 5

Republicans Republicans
No Children With Children
Voted Yes= 15 Voted Yes=20
Voted No= 35 Voted No=30

How to construct a zero order school referendum attitude table by parenting status? How do calculate table's correlation coefficient, calculate the partial table correlations and determine whether the researcher hypothesis is correct for both Democrats and Republicans.