If Two Populations Are Normally Distributed, the Sampling Distribution of the Difference

question 54

Multiple Choice

If two populations are normally distributed, the sampling distribution of the difference in the sample means, $\bar { X } _ { 1 } - \bar { X } _ { 2 }$ , is:

• A)approximately normal for any sample sizes.
• B)approximately normal if both sample sizes are large.
• C)exactly normal only if both sample sizes are large.
• D)exactly normal for any sample sizes.

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Definitions:

GABA

A major inhibitory neurotransmitter in the brain involved in reducing neuronal excitability throughout the nervous system.

Voluntary Movements

Movements that are consciously controlled by the brain, involving motor planning and execution.

Acetylcholine

A neurotransmitter in the nervous system involved in muscle activation, memory, and learning.

Muscles

Tissues in the body that have the ability to contract, enabling movement of the body and its parts.