Two Independent Samples of Sizes 20 and 30 Are Randomly

question 18

Multiple Choice

Two independent samples of sizes 20 and 30 are randomly selected from two normally distributed populations.Assume that the population variances are unknown but equal.In order to test the difference between the population means, ,the sampling distribution of the sample mean difference, ,is:

• A) normal.
• B) Student-t with 50 degrees of freedom.
• C) Student-t with 48 degrees of freedom.
• D) None of these choices.

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Definitions:

Naturalistic Observation

involves studying subjects in their natural environment without any manipulation by the researcher, to understand behavior in a real-world setting.

Psychiatrists

Medical doctors specializing in the diagnosis, treatment, and prevention of mental health disorders, capable of prescribing medication.

Psychological Disorder

A configuration of symptoms, either psychological or behavioral, that detrimentally influence several life facets and lead to distress for the affected person.

Clinical Psychologists

Professionals in psychology who assess, diagnose, and treat mental illnesses and behavioral disorders through therapy and interventions.