For a Given Level of Precision and Confidence Level, a Researcher

question 30

Multiple Choice

For a given level of precision and confidence level, a researcher determines that he needs a sample size of 400. The study found that the proportion of people who smoke is 30 percent. For the same level of precision and confidence, he would need the same sample size if the proportion of those who smoke were to change to:

• A) 40 percent.
• B) 50 percent.
• C) 60 percent.
• D) 70 percent.
• E) 100 percent.

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Definitions:

Converses

Statements in which the hypothesis and the conclusion (or subject and predicate) are switched in places.

Contrapositive

A logical statement formed by negating and swapping the positions of the hypothesis and conclusion of the converse of a conditional statement.

Amelodic

Lacking a coherent melody or not based on traditional harmonic structures.

Subcontraries

In logic, two propositions that can both be true but cannot both be false, used particularly in the context of categorical propositions.