In Testing the Difference Between Two Population Means, Using Two $\bar { X } _ { 1 } - \bar { X } _ { 2 }$

question 66

Multiple Choice

In testing the difference between two population means, using two independent samples, we use the pooled variance in estimating the standard error of the sampling distribution of the sample mean difference $\bar { X } _ { 1 } - \bar { X } _ { 2 }$ if the:

• A)sample sizes are both large.
• B)populations are normally distributed.
• C)populations have equal variances.
• D)populations are normal with equal variances.

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Definitions:

Personality Differences

Variations in the characteristic patterns of thinking, feeling, and behaving among individuals.

Major Sources

Major sources refer to the primary or most important origins or points of information, supply, or influence.

Personality Stability

The consistency of individual characteristics, traits, and behaviors over time.

Positive Emotions

Feelings that are enjoyable or pleasing, such as happiness, joy, excitement, and love.