One benefit is that if the whole population can vote, then the whole population will feel included in the country and will want to contribute to it. I
Additionally, if there is a group that is excluded from voting, there might be unrest and conflict because this group could clash with the other groups, demanding these rights.
Finally, the decisions will be more informed and will take into account everyone's opinion, not just selected people's
The Boll Weevil was an insect that destroyed crops in Alabama in Georgia. The reason they were effect at different times is because they had different crops and the Boll Weevil migrated at different times.
Yes, traveling in groups of two or more affects the independence assumption.
The probability that the whole group shows up is 0.8 and that the group does not show up is 0.2.