If you have been asked to sample 60 people from a chosen population for an observational study. You need to ask a question that separates the sample i

If you have been asked to sample 60 people from a chosen population for an observational study. You need to ask a question that separates the sample into two groups, so that you can compare results of another question across the two groups. Therefore, your survey will only be two questions: two numerical data questions or one numerical and one categorical question.
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The finally answer : one categorical question is required based on answer of which the groups are divided And one numerical question, whose result is compared across the groups. So one numerical and one categorical