Anjali plans on giving presents to 9 randomly selected family members. To make sure all generations are included, Anjali randomly selected 3 aunts, 2 grandparents and 5 cousins. What type of sampling method did Anjali use? O stratified O voluntary response O simple random sample O cluster O convenience Question 13 1 pts Identify a potential confounding variable in the study below. Researchers want to determine if "sedentary lifestyle" (tending to spend much time seated; somewhat inactive) causes fatigue (tiredness; having little energy). The researchers survey 100 participants asking about their lifestyle and energy levels throughout the day. Table