To explain why we cannot use a chi-square test to learn whether these two distributions differ significantly.
Explanation of Solution
In the question, the researchers want to find out how do U.S. residents who travel overseas for leisure differ from those who travel for business. And the table for the leisure travel and business travel are given breakdown by the occupation in the question. Thus, we cannot use a chi-square test to learn whether these two distributions differ significantly because to use the chi-square test, we need to know the actual counts. However in the table we note that only the proportions have been given and thus we cannot apply the chi-square test.
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