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

question 15

Multiple Choice

The following display from a TI-84 Plus calculator presents the results of a hypothesistest for the difference between two means. The sample sizes are $n _ { 1 } = 10 \text { and } n _ { 2 } = 15$

How many degrees of freedom did the calculator use?

• A) 20.308612
• B) -4.343066
• C) 19.308612
• D) 0.000158

---

Definitions:

Mentoring

A relationship where a more experienced or knowledgeable person helps to guide a less experienced or knowledgeable person.

Informal Training

A learning process that occurs in a less structured context, without formal curriculum, often as part of daily activities.

Experienced Employee

An individual who has gained a significant amount of knowledge, skill, and expertise in their profession over time.

Hawthorne Effect

A phenomenon where individuals modify an aspect of their behavior in response to their awareness of being observed.