Which Critical Value Is Appropriate for a 99 $\sigma$ Is Unknown and the Population Appears to Be Normally Distributed

question 40

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