In an experiment examining the effects of background noise on people’s ability to understand a verbal message, one group of participants is given a comprehension quiz after listening to a passage being read to them with no background noise. For comparison, a second group of participants is given a comprehension quiz after listening to a passage being read to them with 60 decibels of conversation as background noise. This is an example of a design.

(courts and civil liberties 04.04 hc) "the right of citizens of the united states, who are eighteen years of age or older, to vote shall not be denied or abridged by the united states or by any state on account of age." which of the following reflects the source and impact of this quote? (5 points) the 19th amendment protects the right to vote for all legal adults. before this amendment, voters had to not only be an adult but also serve in the armed forces and be a high school graduate before they could vote. the 26th amendment protects the right to vote for all legal adults. before this amendment, young adults could be in college or even serving the military in combat but not be eligible to choose their leaders for a few years. the 19th amendment prevents states from allowing minors to vote. before this amendment, widespread voter fraud was an issue throughout the states, as parents would vote multiple times using their children's names. the 26th amendment prevents states from allowing minors to vote. before this amendment, candidates directed their campaigns at children and teens through cartoons rather than focusing on real political issues.