Psychoactive drugs alter consciousness by

a. raising the metabolic rate within the body.
b. changing the blood volume level of various substances within the body.
c. deactivating the ganglia within the somatic nervous system.
d. directly influencing brain activity.

ANSWER: d

Psychology

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For the Spearman r, the null hypothesis states that

a. there is no correlation in the sample b. there is no correlation in the population c. the correlation is significant d. the alpha level is zero

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