I think this is another solid question, though again, it looks like you have 3 different years in the dataset, so you might want to compare 1996 to 2014 to look at changes in this question over time. I think the question itself and your rationale for asking it is strong. How are you defining "most popular" though, and how many sectors do you expect to look at? Also, are you limiting your analysis to just the United States, or to all individuals on the list, or are you going to compare United States to another region. Your hypothesis also does a very good job of answering the second half of your research question, but you'd want to be sure to answer all parts of your question in your hypothesis.
I think this is another solid question, though again, it looks like you have 3 different years in the dataset, so you might want to compare 1996 to 2014 to look at changes in this question over time. I think the question itself and your rationale for asking it is strong. How are you defining "most popular" though, and how many sectors do you expect to look at? Also, are you limiting your analysis to just the United States, or to all individuals on the list, or are you going to compare United States to another region. Your hypothesis also does a very good job of answering the second half of your research question, but you'd want to be sure to answer all parts of your question in your hypothesis.
Overall, very solid topic and question here.