On both simple and complex reaction-time tasks, response time __________
A) decreases gradually from the early forties into the nineties
B) remains the same throughout the lifespan
C) increases slowly from the forties to the sixties
D) increases steadily from the early twenties into the nineties
Answer: D
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Factors that are unequal across groups and can prevent a researcher from concluding that it was the independent variable that caused a change in the dependent variable are called _____ variables
a) random b) confounding c) participant d) erroneous
In a study of 4-month-olds played infant-directed speech in various languages, researchers found that infants:
a. only liked the recordings of their own language. b. only liked the recordings of languages not their own. c. liked all of the recordings, both in their native language and not. d. do not like infant-directed speech.
What are cannabinoids?
a) Chemical compounds found in cannabis resin b) Cannabis products mixed with alcohol and used for intoxication c) The species of plant to which cannabis sativa belongs d) Neurotransmitters that activate when cannabis is smoked
Which of the following statements is true about IQ tests?
a) The standard deviation of IQ scores is 2. b) A person's performance on an IQ test is usually compared to his or her age-matched peers. c) The history of the IQ test began in England. d) The mean of IQ scores is 50.