Solve the following proportion. 
a = __________
Definitions:
Independent Samples
Samples selected from the same or different populations, but without any matching or pairing on characteristics.
Registered Democrats
People who are officially enrolled as Democratic Party members with voting rights in the United States.
Registered Republicans
Individuals officially registered to vote as members of the Republican Party in the United States.
Pooled Variance T-test
A statistical test that combines the variances of two samples to test the hypothesis that the means of two populations are equal under the assumption of equal variances.
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