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) $z _ { \alpha / 2 } = 2.583$
C) $t _ { \alpha / 2 } = 2.921$
D) $z _ { \alpha / 2 } = 2.567$

Question

Quizplus · Accepted Answer

Since the population standard deviation is unknown and the sample size is small (n=17), we use the t-distribution. For a 99% confidence level with 16 degrees of freedom (n-1), the critical value is approximately 2.921.

Which Critical Value Is Appropriate for A 99%99 \%99% Confidence Level Where

Which Critical Value Is Appropriate for A $99 \%$ Confidence Level Where