The Following Display from a TI-84 Plus Calculator Presents a $n _ { 1 } = 8 \text { and } n _ { 2 } = 13$

question 17

Multiple Choice

The following display from a TI-84 Plus calculator presents a 95 % confidence interval for the difference between two means. The sample sizes are $n _ { 1 } = 8 \text { and } n _ { 2 } = 13$

How many degrees of freedom did the calculator use?

• A) 15.229294
• B) -0.549
• C) 105.095
• D) -35.082

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