When Testing the Difference Between Two Population Means,the Sample Variances

question 38

Multiple Choice

When testing the difference between two population means,the sample variances are pooled to estimate the population variance when ________.

• A)the population variances are known and equal
• B)the population means are known
• C)the population variances are assumed unequal and unknown
• D)the population variances are assumed equal but unknown

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Definitions:

Major Depressive Disorder

A mental disorder characterized by a persistent and intense feeling of depression that affects how a person feels, thinks, and handles daily activities.

Systematic Desensitization

A behavioral therapy technique used to reduce phobic responses through gradual exposure to the feared object or situation while practicing relaxation techniques.

Fear of Public Speaking

A common form of anxiety where an individual feels an intense fear of performing or speaking in front of an audience.

Aversive Conditioning

A behavioral training process that uses negative stimuli to reduce the occurrence of certain undesirable behaviors.