A Scientist Randomly Divided a Group of 100 Lab Rats

question 46

Multiple Choice

A scientist randomly divided a group of 100 lab rats into two groups of 50. One group was fed regular rat chow while the other was fed the same amount of rat chow with added DDT. Both groups were housed in the same room with the same environmental conditions. At the end of the experiment, rats were weighed and the mean difference calculated.
-Refer to the accompanying narrative. Which variable(s) were manipulated by the scientist?

• A)DDT only
• B)temperature only
• C)weight differences only
• D)both DDT and weight differences
• E)both temperature and weight differences

---

Definitions:

Durable Power Of Attorney

A document that authorizes an agent to act on another’s behalf, with the power either surviving incapacity or becoming effective upon incapacity.

Zoning Changes

Modifications or amendments to municipal regulations that dictate how land and buildings within specific zones can be used.

Agency Relationship

A legal arrangement in which one party, the agent, is authorized to act on behalf of another, the principal, in business transactions or other matters.

Bankruptcy

The legal process by which the assets of a debtor are sold to pay off creditors so that the debtor can make a fresh start financially.