Question content area top Part 1 A researcher studying public opinion of proposed Social Security changes obtains a simple random sample of 30 adult Americans and asks them whether or not they support the proposed changes. To say that the distribution of ModifyingAbove p with caret​, the sample proportion of adults who respond​ yes, is approximately​ normal, how many more adult Americans does the researcher need to sample in the following​ cases? ​(a) 20​% of all adult Americans support the changes ​(b) 25​% of all adult Americans support the changes