The questions that they asked, really do not seem that hard. You should know what your dependent and independent variables are, if you are writing that paper! And you should know the assumptions that you are making. And you should know which variable you expect to find positive or negative and significant. Sorry to sound rude, but these questions are quite reasonable. Now they should have made you feel comfortable, which they did not and in that way, they clearly were bad interviewers.
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