Researchers studying the effects of caffeine tested the reaction times of women who first drank either a beverage with caffeine or a decaffeinated version of the same beverage. In this study, the type of beverage that each participant drinks would be:
a. a placebo
b. the dependent variable
c. the independent variable
d. a confounding variable
C
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What is the difference between an agonist and an antagonist? a. An agonist produces helpful effects and an antagonist produces harmful effects. b. An agonist produces harmful effects and an antagonist produces helpful effects. c. An agonist decreases synaptic activity and an antagonist increases it
d. An agonist increases synaptic activity and an antagonist decreases it.
An individual at the 25th percentile would have a z score of approximately _____
a. +1 b. –.67 c. +.85 d. none of the above
By 1910, it was expected that mind would soon become as irrelevant to psychology as the concept of soul
a. True b. False
What do the female and male condoms have in common?
a. price c. effectiveness rates b. ease of use d. STI protection