Question:

Determine whether the following represent an observational study or a designed experiment. Explain your choice.

1. A study to whether there is a relation between the rate of cancer and an
   individual’s proximity to high tension wires
2. Rats with cancer are randomly divided into 2 groups. One group receives 5mg of an experimental drug that is thought to fight cancer, and the second group receives 10mg of the drug. After two years, the spread of cancer is measured.
3. Seventh-grade students are randomly divided into two groups, One group is taught math using traditional techniques while the other group is taught math using a reform method. After one year, each group is given an achievement test to compare its proficiency with that of the other group.

d. A poll is considered in which 500 people are asked whom they plan to vote

for in the upcoming election.

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