HELLPP PLEASE After becoming sick, a patient sees a doctor who determines the most likely cause is an allergic
reaction and prescribes an antihistamine. The patient returns home and stops burning candles and
incense for the next week while taking the medication. By the end of the week, the patient is feeling
better and is telling all his friends how wonderful the medication was at relieving his symptoms. This
is an example of

1. confounding, as there is no way to tell whether it was the medication that alleviated his
symptoms

2. convenience sampling since he only stopped burning candles and incense because it was easy

3.a double-blind experiment since neither he nor the doctor really knew what was wrong

4. bias since he wanted to feel better