Scenario 4 Rihanna has four backup singers, but she has noticed that with her busy schedule, their voices are
wearing out. She sees a commercial for a tea designed for singers and public speakers that guarantees
to soothe the throat and reduce your voice from "cracking" by 50%. She decides to buy the tea and
experiment on her backup singers. She reviewed recordings of her concerts and counted that her
backup singers' voices "cracked" an average of eight times a show. She then asked two of the singers to
take the tea twice a day for a week. She didn't change the routine of the other two singers. After a
week, she noticed that the voices of the two singers who didn't use the tea still "cracked" and average
of eight times, while the two singers who used the tea only experienced this six times,
Indentify the following and explain your decision.
1. What was Rihanna's initial observation?
2. Indentify the Control Group
3. Indentify the Independent Variable
4. Indentify the Dependent Variable
5. What should Rihanna's conclusion be according to the advertisement?