3 In recent years there has been much talk about the way opi

3. In recent years, there has been much talk about the way opinion polls are conducted. Consider the following type of poll for the U.S. President\'s approval rating. A survey is put up on a website. Anyone can visit this site and complete the survey for free. 3a. What is the population of interest? 3b. What is the sample? Is it a random sample? Explain. 3c. Based on the survey responses, you calculate the sample mean approval rating. Is this sample mean unbiased? Explain.

Solution

a) The population of interest is a group of certain people by which the generalized statement can be made for the entire group. Opinion poll is being conducted on the common public who have voted in the election.Thus the population of interest is the common public of US who have voted in the Election. They can talk about the win of a particular US President.

b) The sample is being chosen randomly from the entire voter list of the US Elections.Thus the sample is a random sample,representative of the entire population.

3 c) Sample Mean approval rating is the percentage of the population respondents who approve the certain person as the President. In this the sample approvalrating is 38.8% who approve Donald Trump to be the President of US. The result is biased because the actual result shows the majority approved Donald Trump to be the President.