Dr Norton Wants to Control for All Possible Confounding Factors

question 1

Multiple Choice

Dr. Norton wants to control for all possible confounding factors in his study of treatment efficacy. He knows that as part of this study he must control for possible placebo effect, which refers to __________.

• A) improvement following treatment with a medically neutral substance
• B) a drug-induced change in specific "target" symptoms
• C) spontaneous improvement in the absence of any therapy
• D) the ability of a drug to prevent a disease

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Definitions:

Null Hypothesis

In statistical hypothesis testing, it is the hypothesis that there is no effect or no difference and is the statement being tested against the alternative hypothesis.

Genetic Characteristics

Attributes, traits, or disorders determined by genes inherited from an individual's parents.

Population Distribution

The spread of different characteristics, such as age or income, among the individuals in a population.

Level Of Significance

A threshold used in statistical hypothesis testing to determine if the null hypothesis can be rejected, commonly denoted as alpha.