4. In the 2022 election cycle, Republican Blake Masters is challenging incumbent Democrat Mark Kelly to represent Arizona in the United States Senate. A recent poll of n= 627 likely voters conducted Sept. 6-7 by Emerson College* showed Kelly leading Masters 47% to 45% with a margin of error of 3.9%. We are interested in the difference in proportions of likely voters who plan to vote for Mark Kelly or Blake Masters.

Construct an interval giving a range of plausible values for the difference in proportions of likely voters who plan to vote for Mark Kelly or Blake Masters using the given sample statistic and margin of error.