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Bba 2001 coursework

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Bba 2001 coursework

  1. 1. 8.0 Coursework 2.1 Please describe strengths and weaknesses of basic sampling techniques. The following table provides a summary of strengths and weaknesses of basic sampling techniques. Non-probability sampling Techniques Strengths Weaknesses Convenience sampling Less expensive, less time consuming, most convenient Selection bias, sample not representative, not recommended for descriptive or causal research Judgemental sampling Low cost, convenient, not time consuming Does not allow generalisation, subjective Quota sampling Sample can be controlled for certain characteristics Selection bias, no assurance of representativeness Snowball sampling Can estimate rare characteristics Time consuming
  2. 2. Probability sampling Techniques Strengths Weaknesses Simple random sampling Easily applied. Result can be projected on population Difficult to obtain sampling frame, expensive, sometimes no assurance of representativeness Systematic sampling Easier to implement than simple random sampling Can decrease representativeness if certain patterns exist in sampling frame Stratified sampling Includes all important subpopulations, precision is improved Difficult to select relevant stratification variables, not feasible to stratify on many variables, expensive Cluster sampling Easy to implement, cost effective and work is reduced Imprecise, difficult to compute and to interpret results
  3. 3. 2.2 Please describe secondary data. Secondary data are normally published data collected by other parties. Government agencies such as Bank Negara, the Department of Statistics, Ministry of International Trade and Industry and other agencies publish their data regularly and provide secondary sources of data to many researchers. In addition, bulletins, journals, newspapers and other publications also provide useful secondary data to researchers. However, some of the secondary data are not current. A researcher needs to choose wisely the secondary data for his research. One advantage of secondary data is that it is easily accessible from the internet, journals, annual reports and newspaper. It is relatively inexpensive because there is no fieldwork required. It also requires less time to collect. Some data such as import and export data are only available from secondary sources. However, there are some disadvantages of secondary data as well. The secondary data may lack accuracy because the measurement procedure and the method of data collection are not explained by the previous researchers. The data may be biased because the original purpose of data collection is not known. Finally, the data may not meet the specific needs and objectives of the current research, or there may be too many constraints involved.

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