DrWelsh Is Doing Experiments Using Drugs

question 7

Multiple Choice

Dr.Welsh is doing experiments using drugs.He is concerned that his subjects will respond to demand characteristics.He may want to control for this by using which of the following?

• A)stratification
• B)two independent variables
• C)a placebo
• D)randomization

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Definitions:

Expected Value

The predicted value of a variable, calculated as the sum of all possible values each multiplied by the probability of its occurrence.

Expected Value

An average value determined by weighing all potential outcomes of a random variable according to their likelihood of happening.

Payoffs

The returns or benefits received from a particular course of action or decision, often evaluated in decision-making processes.

Invest

Allocating resources, usually money, with the expectation of generating an income or profit.