Researchers collected data from an elementary school to assess awareness of dietary guidelines among students at the school. A survey was sent to 200 students, of which 150 students responded, as 50 students did not receive parental permission to participate. So, the response rate was 75%. The researchers decided to focus on determining whether three factors were associated with having good or poor awareness of dietary guidelines (variable 1), age (variable 2), gender (variable 3), and the distance from their home to the nearest supermarket (variable 4). For the last question, students needed to estimate this distance on their own. is the data collection method on this case study mixed method