Scientific method

Read the following story carefully, then answer all the questions that appear at the end of it. [It is a hypothetical study, raised by the teacher, I present all the available information. Than you for your help]

Ana was looking for a project for her school's Science Fair. You read in a scientific journal about a study in which chickens were fed antibiotics. According to the study, chickens that were fed antibiotics grew faster than those that were not fed antibiotics.

Ana thought about this experiment for a long time. After reading more about the topic in the library, she decided to design an experiment using shrimp. She selected a species that grows to a maximum size of 10 centimeters and mature in approximately 6 to 8 weeks. The female produces 100 to 400 eggs that hatch in 2 to 3 weeks. Ana's teacher helped her order 144 shrimp and Ana obtained the antibiotic Aureomycin from her doctor.

Groups	Aureomycin (mg)
1	0
2	2.5
3	5.0
4	100
5	200
6	300

When the shrimp arrived, Ana divided them into 6 groups, each group had 12 males and 12 females. She placed each group in identical glass containers, gave everyone the same food, and changed the water every 7 days. The 6 groups were treated in the same way except that different doses of the antibiotic were added to 5 containers each time the water was changed, as indicated in the following table:

Weekly before changing the water, the average size for each group was noted. These data are presented in the following table.

Groups	AVERAGE SIZE OF THE GROUPS (cm)
	Week 1	Week 2	Week 3	Week 4	Week 5	Week 6
1	1.51	3.12	4.05	4.63	6.05	6.94
2	4.05	6.15	7.23	7.37	7.43	7.45
3	2.55	5.05	6.55	7.55	7.63	7.70
4	4.50	6.50	8.00	9.05	9.55	10.00
5	1.55	3.10	4.20	4.55	4.70	4.75
6	1.55	1.95	2.55	2.85	2.91	2.95

1. Define the problem
2. Express a possible hypothesis
3. Identify the variables: independent and dependent, and 5 variables under control
4. Is there a control group in this research? What function does it have?
5. Underline all the sentences that are part of the experimental design.
6. Analyze the data, what is the conclusion?