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

question 43

Multiple Choice

Do one of the following, as appropriate: (a) Find the critical value $z _ { \alpha / 2 }$ , (b) find the critical value $t _ { \alpha / 2 }$ , (c) state that neither the normal nor the $t$ distribution applies.
$90 \%$ confidence interval for $\mu ; n = 9 ; \sigma = 4.2$ ; population appears to be very skewed.

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

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