The Gallup organization has asked opinions about support of labor unions since its first poll in 1936, when 72% of the American population approved of them. In its 2014 poll, it found that support of labor unions had fallen to 53% of Americans, based on
a sample of 1,540 adults.
a. Calculate an estimated margin of error for these data.
b. What is the range of likely values for Americans who support labor unions in 2014?
c. This analysis is an example of
i. Descriptive statistics
ii. Inferential statistics
iii. A data file
iv. Designing a study