Pew Research reported that 46% of Americans surveyed in 2016 got their news from local television. A similar survey conducted in 2017 found that 37% of Americans got their news from local television. Assume the sample size for each poll was 1200.

a. Construct the 95% confidence interval for the difference in the proportions of Americans who get their news from local television in 2016 and 2017.

b. Based on your interval, do you think there has been a change in the proportion of Americans who get their news from local television? Explain.