PLEASEE HELPP MEE Marie is working in research that specializes in the effects of caffeine on sleep patterns. She wants to know if 25mg of caffeine per day causes restless sleep. Marie finds 200 volunteers to participate in her experiment. Marie gives 100 of the volunteers 25mg of caffeine per day for 30 days. The other 100 get a placebo pill (pill that contains nothing) for 30 days. None of the volunteers know which pill they got. The subjects' sleep patterns are monitored for 30 days in a controlled environment
a. Draw a picture of the experiment below: I
b. What is the independent variable?
c. What is the dependent variable? d. What is a possible hypothesis?
e. What are 3 controlled variables?​