If a psychologist discovers that the blood of patients with schizophrenia contains a certain chemical not found in the general population, we can conclude that
a. this chemical causes a person to develop schizophrenia.
b. having schizophrenia causes this chemical to form in a person's blood.
c. both schizophrenia and the chemical are caused by some unknown third factor, such asthe typical
diet in mental hospitals.
d. the chemical and schizophrenia are related, but no causal relationship has been established.
D
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Which of the following is most characteristic of crack cocaine? a. It attaches equally to all types of receptors within the brain. b. It is often prescribed for its medical benefits
c. It produces its effects on the brain within seconds. d. It affects the brain by the same mechanism that alcohol does.
If Lisa and Adam are typical 5-year-olds, given the research on sex differences in motor skills in early childhood, we would expect that
a. Lisa would perform better on tasks requiring balance? Adam would be better at throwing and kicking. b. Lisa would be better at throwing and kicking? Adam would have better balance. c. Lisa would perform well at throwing? Adam at kicking. d. Lisa would perform well at hopping? Adam at skipping.
In the formula to compute the correlated-groups t test, the denominator in the equation represents:
a. the standard error of the mean. b. the estimated standard error of the mean. c. the standard error of the difference scores. d. the standard error of the difference between means.
Attempts to identify individual genes associated with addiction have found ____.
A. many genes, each with a small effect B. a small number of genes with limited cumulative effects C. many genes, each with a substantial effect D. a small number of genes with substantial cumulative effects