Is there an association between political party affiliation and beliefs about human evolution? A survey of a random sample of U.S. adults by The Pew Research Center for the People and the Press conducted in March and April 2013 recorded each participant€™s political party affiliation and belief about human evolution. The table below gives the data from the Pew Research Center€™s study.
a. Identify the explanatory and response variables. Also identify the type (categorical or quantitative) of each.

b. Based on the table, the proportion of Republicans who believe humans have evolved over time is 0.43, the proportion of Democrats who believe humans have evolved over time is 0.67, and the proportion of Independents who share this belief is 0.65. Do the data provide any indication of an association between political party affiliation and beliefs about human evolution?

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Political party affiliation Republican Democrat Independent Humans have evolved over time 196 472 438 Belief about human evolution Humans have existed in present form 189 190 218 Don't know 47 41 43