9.48. In a poll to estimate presidential popularity, each person in a random sample of 1,000 voters was asked to agree with one of the following statements:
1. The President is doing a good job.
2. The President is doing a poor job.
3. I have no opinion.
A total of 560 respondents selected the first statement, indicating they thought the President was doing a good job.
a. Construct a 95 percent confidence interval for the proportion of respondents who feel the President is doing a good job.
b. Based on your interval in part (a), is it reasonable to conclude that a majority (more than half) of the population believes the President is doing a good job?© BrainMass Inc. brainmass.com March 4, 2021, 8:10 pm ad1c9bdddf
This posting provides concepts of confidence interval using the example of presidential elections.