Match the following:

1.use preexisting groups to study

2.length of swimming pools at homes in Duncanville

3.number of students in classes at DBU Lab School

4.number items and then draw numbers to determine which ones to study

5.subset or part of the subjects to be studied

6.collection of all objects to be studied

7.divide the population into subgroups with like characteristics and then sample

8.number items and then select every 4th item to study

A. continuous variable

B. sample

C. random sampling

D. stratified sampling

E. cluster sampling

F. population

G. systematic sampling

H. discrete variable