Want to reduce the likelihood of any preexisting differences between the groups of participants assigned to different conditions in an experiment you should use

You should use Research participants that are randomly assigned to different groups. This random assignments will help to ensure that the results of the researc are not deceptive. Due to the sensitive nature of its data, almost all Clinical research are carried out with this type of assignments.

The electoral college consists of 538 electors. a majority of 270 electoral votes is required to elect  the president. your state's entitled allotment of electors equals the number of members in its congressional delegation: one for each member in the house of representatives plus two for yoursenators.congress does the electoral college represent