In Testing the Difference Between Two Population Means Using Two $\overline { \mathrm { x } } _ { 1 } - \overline { \mathrm { x } } _ { 2 }$

question 25

Multiple Choice

In testing the difference between two population means using two independent samples,we use the pooled variance in estimating the standard error of the sampling distribution of the sample mean difference $\overline { \mathrm { x } } _ { 1 } - \overline { \mathrm { x } } _ { 2 }$ if the:

• A) sample sizes are both large.
• B) populations are at least normally distributed with equal variances.
• C) populations are non-normal with unequal variances.
• D) All of these are required conditions.

---

Definitions:

Comparative Advantage

The ability of a country, individual, company, or region to produce a good or service at a lower opportunity cost than competitors.

Florida

A state located in the southeastern region of the United States, known for its warm climate, beaches, and diverse cultures.

Georgia

A country located at the crossroads of Eastern Europe and Western Asia, known for its rich history and diverse culture.

Oranges

A type of citrus fruit known for its round shape, orange color, and juicy, sweet flesh, commonly consumed fresh or juiced.