Let us practice this a little. Look atmy examples below. For each tell me what is the population and what is the sample? 1. Researchers want to investigate the average number of hours sleep a night of people with cancer. They collect data from 200 patients at a local doctor's surgery. 2. Researchers want to investigate the average number of calories women in their 50s eat a day. They recruit 5000 participants from magazine advertisements and collect data from these respondents. 3. Researchers want to investigate the average IQ of 4th grade children in Iowa. 4th graders from 5 schools take IQ tests.