Two Independent Samples of Sizes 40 and 50 Are Randomly

question 29

Multiple Choice

Two independent samples of sizes 40 and 50 are randomly selected from two populations to test the difference between the population means . Assume the population variances are known. The sampling distribution of the sample mean difference is:

• A) normally distributed.
• B) approximately normal.
• C) Student t-distributed with 88 degrees of freedom.
• D) None of these choices.

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Definitions:

Self-help Groups

Peer-led groups where members support each other in dealing with shared issues or challenges, such as addiction or mental health problems.

Alcoholics Anonymous

An international fellowship of individuals who share their experiences to solve common problems and help others recover from alcoholism.

Cognitive Therapy

A type of psychotherapy aimed at changing negative patterns of thinking to improve emotional well-being and behavior.

Self-blame

The act of holding oneself responsible for an event or situation, often inappropriately.