The credit of introducing case study method of data collection goes to Frederic Leplay, an English philosopher. Herbert Spencer adopted it and Healey was the first who supported this method and studied Juvenile Delinquency. Later on sociologists, Anthropologists, Ethnologists and other researcher were interested in the study of various cultures by case study method.
Advantages of Sampling Method include Reduce Cost. It is cheaper to collect data from a part of the whole population and is economically in advance, Greater Speed. Sampling gives more time in collection of data, so it is quickly and has a lot of time for collection of inflammation, Detailed Information. Investigator during studying a small universe provides a detail and comprehensive information’s
Non probability sample does not involve random selection and sampling like probably sampling. So we can say that it is not necessary to respect the population. Unlike probability sampling, it does not depend on rationale of probability theory. With probabilistic technique we can have a close look on population. With non-probability technique it is not obvious to represent the population well and how accurate we are.
In probability sampling each element has a probability of being including in sampling. It means that in probability sampling, the selection sample from the universe has an equal chance to all the members. There are four types of Probability Sampling. Simple random sampling, Stratified random sampling, Systematic sampling, Cluster or multi-stage sampling
Sample” is a part of the whole universe selected for the study while “sampling” is the method used for the selection of a simple. According John Meadge: “A sample is a part of the whole universe. While sampling is a process of selecting a part from the whole universe to make the investigation or study more easier.
Census method refers to the complete enumeration of a universe. A universe may be a place, a group of people or a specific locality through which we collect the data. Census method is necessary in some cases like population census, Agriculture Census, animal census etc for gaining vast knowledge.
Some of the factors responsible for the importance of hypothesis are discussed as under.To the Point Enquiry. Hypothesis makes a research activity to the point and destination, Research without hypothesis is like a sailor in the sea without compass. So, research is to the point enquiry of problem due to the guidance of hypothesis.
Personal Experience of a researcher is a great source of hypothesis. On the basis of his personal experience he uses his mind and suggests some points for the eradication of a social problem through developing a good hypothesis. Greater the researcher experience lead to higher hypothesis formation.
A good hypothesis possesses the following certain attributes. Testability. A good hypothesis should be tested empirically. It should be stated and formulated after verification and deep observation. Thus testability is the primary feature of a good hypothesis.