What does the infant mortality statistic measure?
a. the number of infants who survive until adulthood (age 18) out of 1000 babies
b. the number of infants who die within the first year of birth, out of 1000 live births
c. the number of babies who die before being born, out of 1000 pregnancies
d. the number of babies who do not know the difference between right and wrong by age five

B.The number of infants who die within the first year of birth, out of 1000 live births

Explanation:

The infant mortality rate is a social indicator represented by the number of children who died before reaching one year of life per thousand live births in a year. This is an important indicator of the quality of health services in a country. The disclosure of mortality rates is the basis for the government to adopt public policies on health and reproduction.

answer:

d. because dr. laguardia selected a widely used measure, his study generalizes to has strong external validity. external validity has limited external validity. other applications of this measure.

the widely used measure that he applied to his experiment was the benton facial recognition test. it employed on to football players and as result, only players who suffered brain concussions did not pas this test. and although it has an external validity, it is limited because it isn't general to apply to other population.