A tax auditor has a pile of federal tax returns and she has been directed to randomly select 20 of these returns for a special audit.

(0.25 pts) Describe an appropriatesystematicsampling scheme that she could use.

2. A recent radio station asked listeners to go to their website and vote for their favorite singing star. A responder would be randomly chosen and would receive two tickets to the performance of their choice.

(0.25 pts) What type of sampling is used for the vote?

3. A community college is selected at random from all US community colleges and the GPAs and ages of all students from that college are examined.

a. (0.25 pts) What type of sampling was done?

b. (0.25 pts) What is the population of interest for this study?

c. (0.25 pts) If the average GPA is computed for this sample would it be considered a statistic or a parameter?

d. (0.25 pts) Suppose instead the researchers wanted to implement a Simple Random Sample of community college students, how might they do this?

4.(0.5pts)Explain the difference between cluster sampling and stratified sampling. (use complete sentences for credit)