please answer the following questions

Presidential approval Many news organizations conduct polls asking adults in the United States if they approve of the job the president is doing. How did President Obama's approval rating change from August 2009 to September 2010? According to a CNN poll of 1024 randomly selected US adults on September 1-2, 2010, 50% approved of Obama's job performance. A CNN poll of 1010 randomly selected U.S. adults on August 28-30, 2009 showed that 53% approved of Obama's job performance. Use the results of these polls to construct and interpret a 90% condence interval for the change in Obama's approval rating among all US adults. Based on your interval, is there convincing evidence that Obama's job approval rating has changed? Formula: Confidence Intervals for p1 -p2 statistic i (critical value) . (standard deviation of statistic) 511(1 l) + 3320 'i'2) (l _z)iz' As part of the Pew Internet and American Life Project, researchers conducted two surveys in late 2009. The first survey asked a random sample of 800 U.S. teens about their use of social media and the Internet. A second survey posed similar questions to a random sample of 2253 U.S. adults. In these two studies, 73% of teens and 47% of adults said that they use social-networking sites. Use these results to construct and interpret a 95% confidence interval for the difference between the proportion of all U.S. teens and adults who use social-networking sites