Do one of the following, as appropriate: (a) Find the critical value z?/2, (b) find the critical value t?/2, (c) state that neither the normal nor the t distribution applies.
-$90 \% ; \mathrm { n } = 10 ; \sigma$ is unknown; population appears to be normally distributed.
A) $\mathrm { t } _ { \alpha / 2 } = 1.833$
B) $\mathrm { z } _ { \alpha / 2 } = 2.262$
C) $\mathrm { t } _ { \alpha / 2 } = 1.812$
D) $\mathrm { z } _ { \alpha / 2 } = 1.383$

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The Answer of Do one of the following, as appropriate: (a) Find the critical value z?/2, (b) find the critical value t?/2, (c) state that neither the normal nor the t distribution applies.
-$90 \% ; \mathrm { n } = 10 ; \sigma$ is unknown; population appears to be normally distributed.
A) $\mathrm { t } _ { \alpha / 2 } = 1.833$
B) $\mathrm { z } _ { \alpha / 2 } = 2.262$
C) $\mathrm { t } _ { \alpha / 2 } = 1.812$
D) $\mathrm { z } _ { \alpha / 2 } = 1.383$

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