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.

---

Definitions:

Machine-Hours

A measure of the total time that machines are operating during a specific period.

Direct Labor-Hours

The total amount of time spent by workers directly involved in the production of goods, measured in hours.

Total Job Cost

The cumulative cost of materials, labor, and overhead for a specific job, useful in tracking expenses and determining profitability for that job.

Machine-Hours

A measure of the amount of time a machine is used in the production process, often used as a basis for allocating costs to products.