Researchers from a local hospital sought to determine factors associated with readmission among patients treated for a heart attack. A survey was sent to all patients admitted to the hospital for a second heart attack within one year of their first heart attack. The same survey was sent to all patients who had a heart attack but were not admitted for at least a year following that heart attack. Because the survey was given while they were at the hospital, 90% of those readmitted to the hospital responded. Because the survey was mailed to those who were not readmitted, only 40% of those patients responded. The researchers decided to focus on determining whether three factors were different between patients who were readmitted and patients who were not readmitted (variable 1), age (variable 2), gender (variable 3), and the number of stressful life events over the previous year (variable 4). For the last question, respondents needed to recall and write a list of all these events, and the researchers counted them. is this considered a quantitative method for data collection