b. Construct a 95% confidence interval for the difference in mean salaries and explain the information the confidence interval contains. Type of problem: Other information requested: 6. AOL conducted an Internet poll and asked users to respond to the question: "Where do you live?" If a user chose to respond, he or she could choose either "urban area" or "rural area". Results included 51,318 responses of "urban area" and 37,888 responses of "rural area." (5 points) a. Use the given poll results with a 0.01 significance level to test the claim that most people live in urban areas. Record the results below. b. Which of the following best describes the type of sample: convenience, simple random sample, voluntary response sample, stratified sample, cluster sample? Explain why you selected that type of sample. c. Consider the sampling method used, how does this affect your answer from part (a)? d. Given that the size of the sample is extremely large, can this sample size compensate for a poor method of sampling? Explain your answer. e. What valid conclusion can be made from the sample results? Based on the sample results, what can we conclude about the whole population