Do one of the following, as appropriate: (a) Find the critical value $z _ { \alpha / 2 }$, (b) find the critical value $t _ { \alpha / 2 }$.
$99 \% ; n = 17 ; \alpha$ is unknown; population appears to be normally distributed.
A) $z _ { \sigma / 2 } = 2.583$
B) $z _ { \sigma / 2 } = 2.567$
C) $t _ { \sigma / 2 } = 2.921$
D) $t _ { \sigma / 2 } = 2.898$

Question

Quizplus · Accepted Answer

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

Do One of the Following, as Appropriate: (A) Find the Critical