Do one of the following, as appropriate: (a) Find the critical value $\mathrm { z } _ { \alpha / 2 }$ , (b) find the critical value $t _ { \alpha / 2 }$ , (c) state that
neither the normal nor the t distribution applies.
-$90 \% ; \mathrm { n } = 9 ; \sigma = 4.2 ;$ population appears to be very skewed.
A) $\mathrm { z } _ { \alpha / 2 } = 2.365$
B) $\mathrm { z } _ { \alpha / 2 } = 2.306$
C) $\mathrm { z } _ { \alpha / 2 } = 2.896$
D) Neither the normal nor the t distribution applies.

Question

Quizplus · Accepted Answer

The sample size is small (n=9), the population is very skewed, and the population standard deviation is known, but the normal distribution does not apply due to skewness. The t-distribution is also not appropriate due to the small sample size and skewness.

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