A Statistics Professor Wishes to Estimate the Average Mark on a Term

question 8

Multiple Choice

A statistics professor wishes to estimate the average mark on a term test for a course that has multiple sections and many students. A survey of some of the students registered for the course reveals the following results: The student from the course wonders whether the population mean could have been 75 or 80.

• A) Since 80 is within the 95% confidence interval, the population mean is likely to be 80.
• B) Since 80 is not within the 95% confidence interval, the population mean is not likely to be 80.
• C) Since 75 is within the 95% confidence interval, the population mean is likely to be 75.
• D) Since neither 75 nor 80 is within the 95% confidence interval, the population mean is not likely to be 75 or 80.
• E) B & C are true

---

Definitions:

Croissants

A flaky, buttery pastry of French origin that is made in a crescent shape and is often eaten for breakfast.

Perfectly Competitive

A perfectly competitive market is a theoretical market structure characterized by many buyers and sellers, free entry and exit, homogeneous products, and perfect information.

Mud Statues

Sculptures or figures made out of mud, often used in traditional ceremonies or as art.

Fixed Costs

Costs that do not vary with the level of production or sales, such as rent or salaries.