To estimate the size of a typical housing unit in a certain town, a sociologist plans to use a cluster sampling method to get her data. which of the following describes a cluster sampling method? A) Randomly select a certain number of housing units in the town
B) Divide all housing units into 3 groups: small, medium, large. Then randomly select a certain number from each group
C) divide the town is a non-overlapping regions. Randomly select from the non-overlapping regions, and select all housing units in those regions.
D) obtain a listing of all housing units currently for sale in town, and use the size information given in the listing.
E) obtain the records kept by the town for all housing units in the town, and use the information in these records