From 1912 to 1928, the contact number for measles in the U. S. was 12.8. If we assume that Ro is still 12.8 and that inoculation is 100% effective -- everyone inoculated obtains immunity from the disease -- what fraction of the population must be inoculated to prevent an epidemic?

70-85%

Explanation:

Inoculation is basically developing herd immunity in a given population so that there is no more spread of the virus and the pandemic is prevented.

It is generally believed that if 75-80% people are inoculated then epidemic can be prevented.

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.

using the scientific method.