Two Independent Samples of Sizes 20 and 25 Are Randomly

question 49

Multiple Choice

Two independent samples of sizes 20 and 25 are randomly selected from two normal populations with equal variances.In order to test the difference between the population means,the test statistic is:

• A) a standard normal random variable
• B) approximately standard normal random variable
• C) t-distributed with 45 degrees of freedom
• D) t-distributed with 43 degrees of freedom

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Definitions:

Adjustment

A modification or alteration made to change something, often to correct or improve it.

Opening Paragraph

refers to the first section of a piece of writing, which introduces the topic or main idea.

Routine Message

Regularly occurring communications that follow a standardized format or content, often used in organizational or professional contexts.

Indirect Approach

A communication method where the main point or message is not presented immediately but rather introduced through explanations or supporting details first.