Find the Margin of Error
- $90 \% ; n = 9 ; \sigma = 4.2 ;$

Multiple Choice

Find the margin of error
- $90 \% ; n = 9 ; \sigma = 4.2 ;$ population appears to be very skewed.

A) $\mathrm { z } _ { \alpha / 2 } = 2.896$
B) $\mathrm { z } _ { \alpha / 2 } = 2.306$
C) $\mathrm { z } _ { \alpha / 2 } = 2.365$
D) Neither the normal nor the $t$ distribution applies.