People who eat lots of fruits and vegetables have lower rates of colon cancer th

Question

People who eat lots of fruits and vegetables have lower rates of colon cancer than those who eat little of these foods. Fruits and vegetables are rich in "antioxidants" such as vitamins. A, C and E, Will taking antioxidants help prevent colon cancer? A clinical trial studied 864 people who were a risk of colon cancer. The subjects were divided into four groups: Daily beta-carotene (which is made into vitamin A in the body), daily vitamins C and E, all three vitamins every day, and daily placebo. After four years the researchers were surprised to find no significant difference in colon cancer among the groups. (a) What are the explanatory and response variables in this experiment? (b) Outline the design of the experiment. Use your judgment in choosing the group sizes. (c) Assign labels to the 864 subjects and use table B, starting at line 118, to choose the first 5 subjects for the beta-carotene group. (d) The study was double-blind. What does this mean? (e) What does

Explanation / Answer

a)

The explanatory variable is antioxidants and the response variable is colon cancer.

Since the antioxidants are available in some fruits and vegetable and the colon cancer is effected by the antioxidants.

b)

The design of the experiment is the completely randomized design.

Since there are four treatments only and there is no blocks.

According to my knowledge the size of each group is 216.

c)

Since the both participants and experimenters are not known who are taking the particular antioxidant fruits or vegetables.

d)

That is, there is no effect of colon cancer when taking the fruits or vegetables or vitamins which consists antioxidants.

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.