Degrees of freedom reflect which feature of the experiment?
a. the assignment technique c. the type of task
b. the number of participants d. the internal validity
B
Degrees of freedom are calculated from the number of participants in each group.
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In a clever experiment, Edward Chace Tolman placed rats at the entrance of a maze and recorded how long it took them to arrive at the end of the maze. Some rats were rewarded with food each time they reached the end, other rats were never rewarded, and a third group was rewarded only after the 11th day of training. Starting on the 12th day, this last group ran through the maze just as quickly as the first group that had been rewarded consistently for its performance. How did Tolman explain this surprising outcome?
A. Even in the absence of direct reinforcement, rats in the third group had formed a cognitive map of the maze, allowing them to navigate it quickly after reinforcement was introduced. B. Rats in the third group were simply smarter than rats in the other two groups, and therefore quickly learned the maze after reinforcement took place. C. Rats in the first group had become bored with the continuous reinforcement; their slower speeds made it appear as though rats in the third group had learned quickly. D. Rats in the third group had the opportunity to observe the performance of rats in the first group, and therefore knew that reinforcement would eventually be coming.
An early name for schizophrenia was
(a) anxiety reaction (b) reality phobia (c) manic depressive reaction (d) dementia praecox
According to the article Let's See What This Baby Can Do about the impact of a new baby on a young family, all of the following are predictors of success for satisfaction in marriage except:
(a) similarity in things like age and religion (b) becoming pregnant immediately after marriage (c) knowing each other for at least 6 months (d) family backgrounds of stable marriage patterns
The antipsychotic drug risperidone acts as an antagonist to both ______, thus improving several autism symptoms.
A. oxytocin and GABA B. serotonin and glutamate C. GABA and dopamine D. dopamine and serotonin