A Manager of the Credit Department for an Oil Company

question 57

Multiple Choice

A manager of the credit department for an oil company would like to determine whether the average monthly balance of credit card holders is equal to $75.An auditor selects a random sample of 100 accounts and finds that the mean owed is $83.40 with a sample standard deviation of $23.65.If you were to conduct a test to determine whether the auditor should conclude that there is evidence that the mean balance is different from $75,which test would you use?

• A) t test of a population proportion.
• B) Z test of a population proportion.
• C) Z test of a population mean.
• D) t test of a population mean.

---

Definitions:

Trophic Level

Refers to the hierarchical levels in an ecosystem, determining an organism's position in the food chain, from primary producers to apex predators.

Big Bluestem Grass

A tall North American prairie grass that is a dominant species in the Great Plains, known for its nutrient-rich forage.

Abiotic Components

Non-living chemical and physical parts of the environment that affect living organisms.

Biotic

Term that indicates life; a cell is an example of a biotic factor in the environment.