For Exercises 3.1 to 3.4, see page 124; for 3.5, see page 126; for 3.6, see page 126; and for 3.7 and 3.8, see page 127.
3.7 Market share for energy drinks.
A website reports that Red Bull is the top energy drink brand with sales of $2.9 billion in 2014.5 Do you think that this report is based on an observational study or an experiment? Explain your answer.
3.7
Observational study because they are just observing which brand has the most sales.