Can undergraduate students determine whether text has been plagiarized?

In two studies undergraduate students were given an original paragraph and several rewritten versions of the paragraph, some of which were plagiarized (e.g., without a citation, superficially modified from the original) and some correctly paraphrased. Students were asked to determine whether each rewritten version had been plagiarized or correctly paraphrased. Approximately 74% of the students in both studies correctly identified the paraphrased...