Lilian's favorite magazine published 505050 issues last year, and each issue contained approximately 250250250 pages. She wants to take a cluster random sample of about 1{,}0001,0001, comma, 000 total pages to estimate what proportion of all pages contained an advertisement. a. Randomly select 4 issues, and examine every page in those issues
b. Examine 20 randomly selected pages from each of the 50 issues
c. Assign a unique number to each page, and use a computer to randomly select 1,000 of those numbers
d. Put the issues in a random order and examine every 10th page until 1,000 pages have been examined