(a) At the 5% significance level, the data provide convincing evidence of a real difference in the proportion who are not affected personally between Americans who make less than $40,000 annually and Americans who make $40,000 annually. (b) We are 95% confident that 16% more to 2% fewer Americans who make less than $40,000 per year are not at all personally affected by the government shutdown compared to those who make $40,000 or more per year. (c) A 90% confidence interval for (p<40K − p≥40K) would be wider than the (−0.16, 0.02) interval. (d) A 95% confidence interval for (p≥40K − p<40K) is (-0.02, 0.16).