1. The Pew Research Center recently selected a random sample of 269 adults in their 20s and found that 160 of them use Instagram. A separate random sample of 401 adults in their 30s found that 200 of them use Instagram. (a) Construct and interpret a 95% confidence interval for the difference in the proportion of age groups (adults in 20s - adults in 30s) that use Instagram. (b) Based on the confidence interval in part (a), what conclusion would you make about whether adults in their 20s use Instagram more than adults in their 30s? Justify your