A new study found 2020 Presidential polls had highest level of error in 40 years, undercounting voters for President Trump by roughly 4 points. Why did that happen?
원문출처 : https://www.cnn.com/videos/tv/2021/05/22/2020-presidential-polls-had-highest-level-of-error-in-40-years.cnn
원문출처 : https://www.cnn.com/videos/tv/2021/05/22/2020-presidential-polls-had-highest-level-of-error-in-40-years.cnn