1. The problem asks whether to use primary or secondary data in two situations. 2. For determining the percentage of fellow workers who drink at least one coffee a day, you would use **primary data** because you need specific, current information directly from your group of fellow workers. This involves collecting data firsthand through surveys or observations. 3. For finding the average weight of Canadian men, you would use **secondary data** because this information is likely already collected and published by reliable sources such as government health databases or research studies. Using secondary data saves time and resources. 4. Summary: - Use primary data when you need specific, original data directly from the source. - Use secondary data when reliable data already exists and can be accessed.