7.82 What survey design is used in each of these situations?

a. A random sample of n = 50 city blocks is selected, and a census is done for each single-family dwelling on each block.

b. The highway patrol stops every tenth vehicle on a given city artery between 9:00 A.M. and 3:00 P.M. to perform a routine traffic safety check.

c. One hundred households in each of four city wards are surveyed concerning a pending city tax relief referendum.

d. Every 10th tree in a managed slash pine plantation is checked for pine needle borer infestation.

e. A random sample of n = 1000 taxpayers from the city of Halifax is selected by Revenue Canada and their tax returns are audited.