If We Are Testing the Difference Between the Means of Two

question 44

Multiple Choice

If we are testing the difference between the means of two normally distributed independent populations with samples of n₁ = 10, n₂ = 10, the degrees of freedom for the t statistic is ________.

• A) 19
• B) 18
• C) 9
• D) 8
• E) 20

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Definitions:

Lifetime Prevalence

The proportion of individuals in a population who have ever experienced a specific disorder at any time in their lives up to the point of assessment.

Psychological Disorders

Mental disorders characterized by patterns of thought, feeling, and behavior that are significantly distressing or impairing in social, occupational, or other important functions.

Anxiety Disorder

An emotional health condition identified by persistent and overwhelming emotions of apprehension, worry, or panic that negatively affect daily life.

Driving

The act of operating and controlling a vehicle, such as a car, truck, or motorcycle, usually on roads.