could you help for all those question

Question 8 1 pts Which of the following research methods would most effectively demonstrate that regular aerobic exercise predicts people's memories? experimental study naturalistic observation O case study correlational study Question 5 1 pts In reporting the effect of drinking beer on self-consciousness, psychological researchers would give beer to only one group. This group is called O randomly selected group selected group O experimental group control group Next Previous Question 4 1 pts Scientists conducted a study in order to determine whether "Smoking a cigarette decreases the volume of air that can be inhaled into the lungs." Which of these is the best description of the phrase in quotes? a result a theory a hypothesis O a law Na Previous