1. For example if a sample constitutes 200 teachers, each teachers in the sample are considered as a sampling … He administered his research tool in each sample, collected the data, organized, scored and found the mean scores of each group. It is the Sampling procedure, which will decide the accurate representation of the sample selected for the study as well as the relevance of generalization made from the research. He/she can write the names or roll numbers of the whole students on separate slips of paper in equal size and colour- and fold them in similar way. For example if a sample constitutes 200 teachers, each teachers in the sample are considered as a sampling unit. Distinguish between Population and Sample. Systematic sampling: Systematic sampling is a sampling method where the researcher chooses respondents at equal intervals from a population. 2. He can stratify the population in to three such as science graduate, social science graduate, commerce graduate. It follows a systematic procedure for sample selection, iii. This is because of; a random sample will not be identical representation of a population. When using the nondestructive method for this purpose, the sampling area shall cover a minimum of 100 cm2 (50 cm2 for small ruminant carcases) per sampling site. The unlimited or unknown number of population can be called as infinite population. There is no notion about the minimum or maximum number of sample; instead the sample size should be optimum. Here the population is divided in to two or more strata. More strata requires large sample size, iii. Systematic sampling can be defined as selecting or drawing of every nth item or person from a pre determined list. It can be very broad or quite narro… Handbook on Data Quality - Assessment Methods and Tools, https://ec.europa.eu/eurostat/statistics-explained/index.php?title=Glossary:Area_sampling&oldid=219767. Am doing a qualitative research on “An assessment on the factors that affect the the reduction of flood impacts on sanitation in rural areas: A case of Sekeni village in Chikwawa, Malawi”. Each of the chosen sub-areas is then fully inspected and enumerated, and may form the basis for further sampling if desired. Sampling can be done through various sampling techniques in accordance with the nature of the sample as well as the subject matter of the study. Representative samples are the samples which are closely match the actual characteristics of the population from where the samples have been drawn. It serves as a foundation of all other random sampling techniques, iv. Sampling frame is the list of subjects/people under the study, such as household,, students, teachers, principals and so forth. eur-lex.europa.eu Bei Anwendung de s nichtdestruktiven V er fahrens für diesen Zweck ist ein e Probefläche j e Probestelle von mindestens 100 cm2 (50 cm2 bei Schlachtkörpern kleiner Wiederkäuer) abzudecken. Unskilled and untrained researcher may cause for making wrong, i. For example, startups and NGOs usually conduct convenience sampling at a mall to distribute leaflets of upcoming events or promotion of a cause – they do that by standing at the mall entrance and giving out pamphlets randomly. Random sampling is free of bias in selecting sampling unit. Judgment sampling is economical, more convenient, easily accessible and select only those persons who can give relevant information to the research area. The prime concern of judgment sampling is that to understand or judge the researcher that who can pour the accurate information regarding the topic of the study to the researcher. This sampling technique can be also called as area or multi stage sampling. Finally he can see that each group shows differences in their mean scores with another group or sample as well as with the population mean. my sample population is 1050 and am having troubles on what formula should i use to find my sample size. Each of the chosen sub-areas is then fully inspected and enumerated, and may form the basis for further sampling if desired. The term does not suggest any mistake in the sampling process, but merely describe the chance variations that are inevitable when a number of randomly selected sample means are computed. Describe the advantage and limitations of stratified random sampling, Dr. RAFEEDALI.E, Assistant Professor,MANUU, CTE, Srinagar, 9419035681, email@example.com, Creative Commons Attribution 4.0 International License, I) Non-Random sampling techniques (Non- Probability Sampling), II) Random sampling techniques (Probability Sampling), i. Large sample size is required to establish the reliability. Initially, government can select any 10 states from different parts of the country. Random sampling methods are the methods which ensure the probability of each element in the population for being selected as sample unit for the study. It increase the precision in estimating the attributes of the whole population, ii. Here the researcher may use different methods to identify the cases and approach them to get relevant data. It is a sociometric sampling method and also known as network, chain referral or reputation sampling method. The sample should clearly represent the characteristics of intended group. In unintentional cases the same thing might be happen through the random selection of the particular class from a several classes of the school. Convenience sampling is also called as haphazard as well as accidental sampling. Blalock (1960) classified the sampling methods in to two categories on the basis of the nature of selection of the sample units. Understand the various sampling techniques of Random Sampling and NonRandom Sampling theories. Here probability of selection is 1/50 Reading this unit, the student will able to, 1. Differentiate between sampling frame and sampling unit with example. The populationis the entire group that you want to draw conclusions about. It is used when we don’t have any kind of prior information about the target population. The term universe is also used as synonyms to population. Even though it is an unintentional selection of the sample, it should have affected the result of the study as it was not the real representation of the actual characteristics of the population. This variation of sample means is due to sampling error. Sometimes population can be counted easily, which is called finite population. For example, while selecting 1,000 volunteers for the Olympics from an application list of 10,000 people, each applicant is given a count … These categorized populations are called subpopulations. This content is licensed under the Creative Commons Attribution 4.0 International License. The approach to select the sample is to pick a starting point and then pick respondents at a pre-defined sample interval. Hence these methods are also called as Probability sampling methods. Basic requirements of simple random sampling. The population can be defined in terms of geographical location, age, income, and many other characteristics. It provide more convenience in sampling, iii. This is what is called as convenience sampling. Ensure a systematic process of selection where one unit of selection has noimpact on the chances of selecting another unit. The value which is identified or measured from the characteristics of the sample can be termed as statistic. Although it has some limitation it enables the investigator to introduce a little control over the sample. Prepare a comprehensive list of all the units in a population of interest2. Random sampling techniques (Probability Sampling). Suppose the researcher has selected ten groups or samples each consisting of 200 students from same population. Definitely the researcher has to selects accurate representation or optimum sample from the large population of his study. More representative of the population as it includes the each subgroup of, vi. Population of medical students is an example of finite population. Usually the sample size is denoted by the letter (n). Randomness completely depends on the procedure of selection of sampling units from the population. The selected students (slips) are considered as the sample for the study. Every person has an equal chance of being selected, ii. iv. Sample can be selected through different methods. The usual stratification factors are age, sex, socio economic status, educational qualifications, locale, occupation, religion, cast, intelligence and so forth. Here the sample units are not selected at the discretion of the researcher instead it follows certain procedures which ensure the probability of each unit in the population of 6 being included in the sample. In social science and educational research, practically it is not possible to a researcher to approach all the individuals\elements in a population for the purpose of data collection.
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