A Student Wanted to Quickly Construct a 95% Confidence Interval

question 37

Multiple Choice

A student wanted to quickly construct a 95% confidence interval for the average age of students in her statistics class. She randomly selected 9 students. Their average age was 19.1 years with a standard deviation of 1.5 years. What is the 95% confidence interval for the population mean?

• A) [0.97, 3.27]
• B) [15.64, 22.56]
• C) [17.97, 20.23]
• D) [17.95, 20.25]
• E) [17.42, 20.78]

---

Definitions:

Market Rate

The Market Rate is the current price or rate at which a good or service can be bought or sold in a competitive marketplace.

Issue Price

It refers to the price at which a new security, such as a bond or stock, is offered to the public for sale.

Present Value

The present value of a future amount of money or succession of cash flows, assuming a certain rate of return.