A poll asked whether states should be allowed to conduct random drug tests on elected officials. Of 19,035 respondents, 93​% said​ "yes."   a. Determine the margin of error for a​ 99% confidence interval. b. Without doing any​ calculations, indicate whether the margin of error is larger or smaller for a​ 90% confidence interval. Explain your answer.

Refer to the accompanying data set of 20 randomly selected presidents. Treat the data as a sample and find the proportion of presidents who were taller than their opponents. Use that result to construct a 95% confidence interval estimate of the population percentage. Based on the result, does it appear that greater height is an advantage for presidential candidates? Why or why not? Click the icon to view the table of heights. Construct a 95% confidence interval estimate of the percentage of presidents who were taller than their opponents. (Round to one decimal place as needed.) McKinley    170    178Lincoln    193    188Reagan    185    177Taft    182    178Harrison    173    168Van Buren    168    180Harding    183    178Eisenhower    179    178Taylor    173    174Garfield    183    187J. Kennedy    183    182Harrison    168    180J. Q. Adams    171    191Clinton    188    188Nixon    182    180Johnson    192    180Hoover    182    180T. Roosevelt    178    175Buchanan    183…

Students at a certain college were asked if they have a car. After surveying 601 students, it was found that 40.3% of them have a car. The margin of error was 4% with a 95% confidence level. What does this margin of error tell you about the percentage of students at that college who have a car? We can be 95% confident that somewhere between % and % of the students at that college have a car.

Need help on this practice. A and B please