Help please! Multiple choice questions: An advertiser wants to measure audience response to a new movie. He randomly selects 10 showings of the film and surveys every attendee to these showings. This is an example of:

A) Cluster sampling

B) Simple random sampling

C) Snowball sampling

A researcher wants to determine whether caffeine impacts memory. She breaks her subjects up into four groups: no caffeine, half a cup, a full cup, and two cups. She then has them complete a memorization task. What is the dependent variable?

A) The location of her
experiment

B) Amount of caffeine

C) The number of subjects