'I did a survey about our stuents' daily (life) habits.' Your sentence is just fine. (aside from the spelling error - "stuents' " should be "students' ") Using the word, "conducted" instead of, " did " could make it a little more descriptive, but it is not critical.

I conducted a survey on the lifestyles of our students.

Hi Henry. I'm asking about this sentence: I did a survey about students' daily habits. I mean I'm not talking about their study habits, for example.

If standalone sentence: 80% of the students in the sample report exercising on a daily basis. If there is some sort of a headline. 80% of the students engage in daily exercise.