A 95% Confidence Interval Estimate for a Population Mean

question 60

Multiple Choice

A 95% confidence interval estimate for a population mean  is determined to be 43.78 to 52.19. If the confidence level is decreased to 90%, the confidence interval:

• A)becomes wider.
• B)remains the same.
• C)becomes narrower.
• D)None of these choices are correct.

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Definitions:

Phonetics

The study of speech sounds.

Phrenology

The idea (now discredited) that psychological strengths and weaknesses could be precisely correlated to the relative sizes of different brain areas.

Linguistic Performance

The observable use of language in communication; how well an individual can produce spoken or written language in real-life situations.

Linguistic Competence

The subconscious knowledge of grammar that allows a person to use and understand a language.