The Following Display from a TI-84 Plus Calculator Presents the Results

question 19

Multiple Choice

The following display from a TI-84 Plus calculator presents the results of a hypothesis test for the difference between two means. The sample sizes are $n _ { 1 } = 7$ and $n _ { 2 } = 12$ .


How many degrees of freedom did the calculator use?

• A) 10.791309
• B) 11.791309
• C) 0.189353
• D) -0.917205

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Definitions:

Standard Deviation

A statistical measure that quantifies the variability or dispersion of a set of data points or returns of an investment.

Annual Returns

The percentage change in the value of an investment over a one-year period.

Risk Premium

The extra return expected by an investor for holding a risky asset, compared to a risk-free asset.

Corporate Bonds

Debt securities issued by corporations to finance their operations, expansion, or other spending needs, paying fixed or variable interest rates to investors.