Choose one of the following scenarios, then identify a hypothesis and design a n

Choose one of the following scenarios, then identify a hypothesis and design a nonexperimental study to assess the research question:
There is more violent crime during the summer than in the winter.
People who donate organs are more altruistic than those who have not.
Older people exercise less than middle-aged people.
People who were in New York City on 9/11 have higher rates of anxiety than those who were not.
People who have survived plane crashes are optimistic.