The infant mortality rate
a. has increased slightly in the U.S. over the past few decades.
b. is almost triple the national average for blacks.
c. is a measure of nutritional status only used in the United States.
d. is used to describe the population’s health and nutritional status.
Answer: d. is used to describe the population’s health and nutritional status.
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______ is the frequency total for the column times the frequency total for the row divided by the sample size.
A. Pearson r B. Cohen's d C. Chi-square test D. Expected frequency
Every time Bert slices onions, the onions burn his eyes and tears run down his face. One day he opened the silverware drawer and pulled out the knife that he uses only to peel onions and immediately started to shed tears from the sight of the knife. In this situation, the onion is the __________, and the knife is the __________.
A. conditioned stimulus; unconditioned stimulus B. unconditioned stimulus; conditioned stimulus C. conditioned response; unconditioned response D. unconditioned response; conditioned response
People who are attracted to members of the same sex have a ______ orientation
a. unisexual c. bisexual b. homosexual d. heterosexual
Emma and Anna are identical twins who were adopted by different families a few weeks after their birth. Although genetically identical, they grew up with different physical and psychological characteristics. For example, though both inherited a tendency to grow large, Anna was slim and athletic because of the active lifestyle practiced in her adoptive family. This variability can be explained by how
A. longevity genes can make an individual less vulnerable to certain diseases. B. mutated genes can be a source of genetic variability. C. for each genotype, a range of phenotypes can be expressed. D. each zygote is unique.