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A one-sample test for a proportion should have been performed because only one sample was used.
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Explanation:
As the problem states at the very top, "Dan selected a random sample" which is paraphrased to "Dan selected ONE random sample". That keyword "one" means Dan should have used a one-sample test for a proportion. Not a difference in proportions test. This may seem like a trick question, but it's not.
If Dan had 2 samples, then he would go for the difference in proportions of course.