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

Jude is making cement for a driveway. the instructions show the amount of each ingredient to make 1 batch of cement. complete each statement to adjust the ingredients for each new situation if jude uses these instructions.

Acaterer knows he will need 60, 50, 80, 40 and 50 dinner napkins on five successive evenings. he can purchase new napkins initially at 25 cents each, after which he can have dirty napkins laundered by a fast one-day laundry service (i.e., dirty napkins given at the end of the day will be ready for use the following day) at 15 cents each, or by a slow two-day service at 8 cents each or both. the caterer wants to know how many napkins he should purchase initially and how many dirty napkins should be laundered by fast and slow service on each of the days in order to minimize his total costs. formulate the caterer’s problem as a linear program as follows (you must state any assumptions you make): a. define all variables clearly. how many are there? b. write out the constraints that must be satisfied, briefly explaining each. (do not simplify.) write out the objective function to be minimized. (do not simplify.)

Arectangular garden is 5 feet long and 3 feet wide. a second rectangular garden has dimensions that are double the dimensions of the first garden. what is the percent of change in perimeter from the first garden to the second garden?