Ecause researchers are generally more concerned with establishing internal validity rather than external validity, they are typically more concerned with and less concerned with .

Random assignment;

Random selection

Explanation:

Random assignment is a technique for placing subject into the different groups so that the characterstics of the sample can be equally distributed while Random Selection is how we select individuals from the population to participate in study.

whitch constitution would be inadequate as a basis for government today?

the answer would be a) it only allowed catholics to be in government.

d.

thist title points out that you are explaining the nature of the u.s. government. it is the most specific. a representative government consists of a government where decisions are taken according to a voting system. the most essential aspect of a representative government is found in the different structures where voting rights are granted to different groups of people. for example, voting for governor, mayor, president, local police chief etc.