When investigators study changes in different ethnic and racial groups across several decades by using Census information in the United States,
a. there are problems interpreting the data because criteria for inclusion in racial categories have changed several times over the past century.
b. the data are usually highly reliable people have always been placed into well-defined categories.
c. it is difficult because the government does not release information from the Census that could be controversial.
d. the data are usually reliable because the Census has always relied on self-categorization, so it has avoided categories that aren't useful.
Question 2
When researchers try to study potential differences across racial and ethnic groups, the categories they use
a. now rely on well specified biological and genetic differences.
b. generally overlap with religious categories, making comparisons difficult.
c. are unchanging for a single individual over that person's lifespan.
d. often rely on governmental rather than scientific criteria.
Gaser and Schlaug's study of the size of visual, motor, and auditory nuclei in the brains of mu
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