A Student Wanted to Quickly Construct a 99% Confidence Interval

question 15

Multiple Choice

A student wanted to quickly construct a 99% 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 99% confidence interval for the population mean?

• A) [17.42, 20.78]
• B) [17.48, 20.72]
• C) [14.23, 23.98]
• D) [0.44, 3.80]
• E) [17.95, 20.25]

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Definitions:

Shareholder Basis

The amount invested in a company by its shareholders plus any earnings retained by the company.

Earnings and Profits

A measure used for tax purposes, representing a corporation's net income plus or minus certain tax-preferred items.

Cash Dividend

A payment made by a corporation to its shareholders, usually in cash, out of its profits or reserves.

Basis

The amount of investment in property for tax purposes, used to calculate gain or loss upon sale or disposition of the property.