The Use of Blind or Double-Blind Investigators in a Study

question 87

Multiple Choice

The use of blind or double-blind investigators in a study is done to avoid:

• A) sampling error.
• B) sample bias.
• C) uncontrollable variables.
• D) researcher bias.
• E) random error.

---

Definitions:

One-way ANOVA

An analytical procedure designed to evaluate if distinct, unrelated groups of three or more have statistically meaningful differences in their mean values.

Nonsmoker

A person who does not smoke cigarettes, cigars, or any other tobacco products.

Null Hypothesis

A statement used in statistics that proposes there is no significant difference or effect, serving as the default or initial presumption to be tested.

One-way ANOVA

A statistical test that evaluates the differences between the means of three or more independent groups on a single factor.