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

question 23

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 $n _ { 1 } = 9 \text { and } n _ { 2 } = 10$ How many degrees of freedom did the calculator use?

• A) 16.933567
• B) 15.933567
• C) 0.001964
• D) -3.366473

---

Definitions:

Athletic Performance

The level of achievement or proficiency demonstrated by an individual in sports-related physical activities.

Drinking Soda

The consumption of soft drinks, which may contain sugar, artificial sweeteners, caffeine, and other substances.

Caffeine

A central nervous system stimulant found in coffee, tea, chocolate, and some medications, known for its ability to enhance alertness and prevent drowsiness.

Mental Alertness

Mental alertness refers to a state of active, cognitive awareness that enables individuals to process information quickly and effectively.