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

question 65

Short Answer

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: $\begin{array}{|l|l|}\hline A&\text { 0.3247}\\\hline B&\text { 0.3282}\\\hline C&\text {0.1054 }\\\hline D&\text { 0.1125}\\\hline\end{array}$

---

Definitions:

Competitive Market

A market structure characterized by a large number of buyers and sellers, free entry and exit, and products that are close substitutes, leading to price competition and efficiency.

Output

The quantity of goods or services produced by a company, industry, or country within a specific period.

Economic Inefficiency

A situation in which resources are not used in the most effective way, leading to potential losses in productivity or value.

Consumer Preferences

The specific desires, likes, and dislikes that influence the purchasing behavior of consumers.