Researcher records naturally occurring behavior and tries not to interfere in any way:
a. descriptive researchb. experimental researchc. naturalistic researchd. correlation research

Arecent poll of 500 residents in a large town found that only 36% were in favor of a proposed referendum to build a new high school. find the margin of error for this poll if we want 95% confidence in our estimate of the percentage of residents in favor of this proposed referendum.