A Student Wanted to Quickly Construct a 95% Confidence Interval

question 114

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 best point estimate for the population mean?

• A) 2.1 years
• B) 1.5 years
• C) 19.1 years
• D) 9 years
• E) 17.6 years

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Definitions:

Compounded Continuously

Pertains to the situation where interest is added to the principal balance of an investment, loan, etc., at an infinite number of times within a specified time period.

Balance

The equality between the sum of the debits and credits in an account, or the stability between opposing forces.

Compounded Annually

Refers to interest calculated once a year on the principal, including any previously earned interest.

Balance

In mathematics, the state in which both sides of an equation or an inequality have equal values or weights.