A Sample of 21 Elements Is Selected to Estimate a 90

question 66

Multiple Choice

A sample of 21 elements is selected to estimate a 90% confidence interval for the variance of the population. The χ² value(s) to be used for this interval estimation is(are) _____.

• A) -1.96 and 1.96
• B) 12.443
• C) 10.851 and 31.410
• D) 12.443 and 28.412

---

Definitions:

Variable Cost

Costs that change in proportion to the level of goods or services that a business produces.

ATC

Average Total Cost, which is the sum of all production costs divided by the quantity of output produced.

MC

Marginal Cost, the change in total production cost that comes from making or producing one additional unit.

AFC

AFC, or Average Fixed Cost, is the total fixed costs of production divided by the quantity of output produced.