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:

Richard Nixon

The 37th President of the United States, whose tenure is marked by significant foreign diplomacy and the Watergate scandal leading to his resignation.

First President

Refers to the inaugural leader of a republic or a nation's head of state, often noted for setting precedents in governance.

California

is a state located on the west coast of the United States, known for its diverse geography, climate, and the entertainment industry.

Swann V. Charlotte-Mecklenburg

A landmark 1971 Supreme Court decision that upheld busing as a legitimate means to achieve integration of public schools in the United States.