Answer:
Step-by-step explanation:
Hello!
You have a group of 30 rats prone to develop cancer, they were numbered from 1 to 30 and a computer randomly selected numbers in groups of ten, a total of three groups of ten rats were determined.
> The way the sampling was made is to make sure each rat of each group was selected at random and is independent of the rest.
Each rat represents a repetition of the experiment.
After the groups were determined, the first one received blueberry extract + regular meal.
The second group received fish oil + regular meal.
The third group received a regular meal with nothing extra added.
Aside from the food, all living conditions were similar.
>In this case you have only one "Factor" which is the type of antioxidant given with the meal and this factor has three levels. Level one "Blueberry", level two "Fish oil" and level three is the "control group"(this type of groups are added as a validation of the experiment, they are put under all the same conditions as the other groups except that they do not receive the treatment considered to affect the response variable, they are usually given a placebo)
To avoid confusing factors all other living conditions were the same.
After two months, each rat was dissected and the number of tumors was counted.
> The response variable is the number of tumors of the rats.
Considering all of this, the matching goes:
1. randomization ⇒ D. computer selecting which rats gets put into which group
2. replication ⇒ B. 10 rats in each group
3. control ⇒ A. having a group without anything extra and similar living conditions for all
4. response variable ⇒ E. number of tumors
5. Factor(s)
⇒ F. type of antioxidant
6. Level(s)⇒ C. blueberry, fish oil, nothing
Have a nice day!
