I If the Null Hypothesis States That There Is No

question 16

Multiple Choice

i. If the null hypothesis states that there is no difference between the mean income of males and the mean income of females, then the test is one-tailed. ii. If we are testing for the difference between two population means, it is assumed that the sample observations from one population are independent of the sample observations from the other population.
iii. When sample sizes are less than 30, a test for the differences between two population means has n- 1 degrees of freedom.

• A) (i), (ii), and (iii) are all correct statements.
• B) (i) and (ii) are correct statements but not (iii).
• C) (i) and (iii) are correct statements but not (ii).
• D) (ii) and (iii) are correct statements but not (i).
• E) (ii) is a correct statement but not (i) and (iii).

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Definitions:

Major Depressive Disorder

A mental health disorder characterized by persistent feelings of sadness, hopelessness, and a lack of interest or pleasure in activities, significantly affecting daily functioning.

Persistent Depressive Disorder

Mood disorder, characterized by mildly or moderately depressed moods, that persists for at least two years.

Psychologists

Professionals trained in the study of the mind and behavior, who apply psychological research and techniques in various settings.

Sadness

An emotion characterized by feelings of unhappiness and low spirits, often as a response to loss or disappointment.