In Testing Whether the Means of Two Normal Populations Are $n _ { 1 } = 20$

question 35

Multiple Choice

In testing whether the means of two normal populations are equal, summary statistics computed for two independent samples are as follows: $n _ { 1 } = 20$ , $\bar { x } _ { 1 } = 10.8$ , $s _ { 1 } = 0.90$ . $n _ { 2 } = 18$ , $\bar { x } _ { 2 } = 9.6$ , $s _ { 2 } = 1.10$ . Assume that the population variances are unequal. The standard error of the sampling distribution of the sample mean difference $\bar { x } _ { 1 } - \bar { x } _ { 2 }$ is equal to:

• A) 0.3247.
• B) 0.3282.
• C) 0.1054.
• D) 0.1125.

---

Definitions:

Physiological Distinctions

Differences in the functions and processes of living organisms that are biologically based.

Cultures

The patterns of behavior, beliefs, and values shared by a group of people.

Fathers

Male parents who play a significant role in children's development, providing support, care, and guidance.

Infants

Very young children, especially those under one year of age.