How would you select a sample for the following situations. Be specific as to how you would select the sample and the data collection technique you would use - phone, mail, or face-to-face. Why?

1. A study of 1,000 professional athletes in Canada.

2. A study of unemployed Canadians.

3. A study of provincial differences in attitudes to private health care.

4. A study of Torontonians' attitudes toward the building of a bridge to Toronto Island.