4. Match the words with their definitions.

1. population	a) an approximate judgment, especially of cost, value, size
2. sample	b) a thing or group having parts or members which are all the same or which consist of only one substance
3. concept	c) a mature, fully developed person or animal
4. random	d) any finite or infinite collection of items under consideration
5. estimate	e) something which consists of many types of things
6. homogeneous	f) made or done without method pr conscious choice
7. heterogeneous	g) a small part or quantity intended to show what the whole is like
8. feasible	h) an idea or mental picture of a group or a class of objects formed by combining all their aspects
9. adult	i) something that can be done, made or achieved
10. crucial	j) something that is extremely important, especially in connection with a particular situation or event in the future.

5. Match the words from the left column with the words from the right one to form as many word- combinations as possible.

   1. to complete	a) facts
   2. heterogeneous	b) project
   3. crucial	c) precautions
   4 to yield	d) study
   5. to select	e) findings
   6. efficient	f) population
   7. to estimate	g) sample
   8. feasible	h) research

6. Translate the following sentences from the text. Paraphrase them .

1. Modern sociology is very much a research enterprise.

2. Whatever the hypothesis, the concepts or variables that compose it define the groups among whom the research must be conducted.

3. Populations are defined , somewhat arbitrarily, in terms of the purposes of a given research project.

4. No matter how defined, however, the appropriate populations for most sociological research are still too large to permit reasonably efficient study.

1. Complete the following sentences using the text.

1. A basic principle … virtually all sampling procedures, is the concept of ….

2. The concept of probability ensures that the … that any given unit of a population will be … for inclusion in a sample is known.

3. The sample will become more … of the universe or population as it is made larger.

4. If researchers had unlimited resources they would not … to sampling in the first place; they would study the entire … .

5. But scientists always … practical problems including how much time, money, and manpower may be … in a given research project.

8. Find the prefixes in the following words and comment on their meanings.

1) decrease, decolonize, destabilize;

2) encourage, entrust, enlarge

3) increase, incorporate, include

4) incorrect, independent, indecent

5) redefine, restate, reorganize.