1. Is the true mean age of students higher than 21?
2. Is the true proportion of students who floss at least once a day a majority?
3. Is there a difference in the true mean exercise hours for students during the week and the weekend?
4. Is there a difference in the true proportions of males and females who wash their hands after every visit to the toilet?
5. Is there a difference in the true mean height of students based on if they always carry an umbrella?
6. Is there a relationship between sex and how a student feels about their weight?