Researchers collected data from a hospital to determine factors associated with hypertension among patients at the hospital. A survey was sent to 1,000 patients who had visited the hospital over the past year, of which 500 patients responded, for a response rate of 50%. Researchers noticed that about 20% of the responses were from people with hypertension, but data from the hospital indicated about 40% of patients had hypertension. The researchers decided to focus on determining whether three factors were associated with hypertension and without hypertension (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 the method of data collection quantiative