Which of the diagrams in the figure shows a motor pathway that uses acetylcholine as a neurotransmitter? 
Definitions:
Independent Sample Variances
A measure of the variability in each of two or more independent samples, used in hypothesis testing to assess the assumption of equal variances.
Normal Populations
Populations that are distributed in a way that forms a symmetrical, bell-shaped curve when graphed, with most members being close to the average.
Equal Variances
The assumption that two or more groups have the same variance, often used in t-tests and ANOVAs.
F Distribution
A probability distribution used in analysis of variance (ANOVA), among other methods, that is right-skewed and originates from the ratio of two chi-squared distributions.
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