Which Critical Value Is Appropriate for a 99% Confidence Level $\sigma$

question 9

Multiple Choice

Which critical value is appropriate for a 99% confidence level where n = 17; $\sigma$ is unknown and the population appears to be normally distributed?

• A) \(t _ { \alpha / 2 } = 2.921\)
• B) \(z _ { \alpha / 2 } = 2.583\)
• C) \(z _ { \alpha / 2 } = 2.567\)
• D) \(t _ { \alpha / 2 } = 2.898\)

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