In Constructing a 99% Confidence Interval Estimate for the Difference

question 15

Multiple Choice

In constructing a 99% confidence interval estimate for the difference between the means of two normally distributed populations, where the unknown population variances are assumed not to be equal, summary statistics computed from two independent samples are as follows: $$\begin{array} { | l | l | l | } \hline n _ { 1 } = 28 & x - \operatorname { bar } _ { 1 } = 123 & s _ { 1 } = 8.5 \\\hline n _ { 2 } = 45 & x - \operatorname { bar } _ { 2 } = 105 & s _ { 2 } = 12.4 \\\hline\end{array}$$ The lower confidence limit is:

• A) 24.485.
• B) 11.515.
• C) 13.116.
• D) 22.884.

---

Definitions:

Active Listening

Listening with greater concentration, less tolerance for distractions, and more feedback to the speaker.

Tolerance

The state of needing more and more of a substance to get the desired effect.

Unconsciously

Operating or existing without conscious awareness or control, often referring to actions or thought processes that occur automatically.

Internal Climate

Refers to the internal psychological and emotional environment within individuals or organizations.