A Student Wanted to Quickly Construct a 95% Confidence Interval

question 12

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]

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Definitions:

Proposal

A formal suggestion or plan put forward for consideration or discussion by others.

Percentage

A way of expressing a number as a fraction of 100, used to compare proportions or calculate ratios.

Efficiency Loss

The loss of economic efficiency that can occur when the equilibrium for a good or a service is not achieved or is unattainable.

Tax

Compulsory financial obligation or different form of levy placed on a taxpayer by a government entity to finance public spending.