Washington State Patrol sets up a roadblock along I5 between Marysville and the Canadian border to estimate the percentage of cars with up-to-date registration and proof of insurance. They usually find problems with about 7% of the cars they stop.

a) The population

b) The population parameter of interest

c) The sampling frames

d) The sample

e) The sampling method

f) Who, if anyone, was not included in the study?

g) Any potential bias issues or other problems in generalizing to the population of interest