Prefinal

• Sampling - is the process of systematically selecting representative elements of a population.
• Determining the Data to be Collected or Describe - The systems analyst needs a realistic plan about what will be done with the data once they are collected. If irrelevant data are gathered, then time and money are wasted in the collection, storage, and analysis of useless data.
• Determining the Population to be Sample - the systems analyst must determine what the population is. In the case of hard data, the systems analyst needs to decide.
• Type of Sample - convenience, purposive, simple, and complex.
• Convenience - not based on probability, sample elements are selected directly without restrictions. it is the easiest to arrange, but it is also the most unreliable.
• Purposive - not based on probability, sample elements are selected according to specific criteria. it is only moderately reliable.
• Simple Random - based on probability, sample elements are selected directly without restrictions. you need to obtain a numbered list of the population to ensure that each document or person in the population has an equal chance of being selected.
• Complex Random - based on probability, sample elements are selected according to specific criteria.
• Complex Random Sampling types - systematic sampling, stratified sampling, and cluster sampling.
• Systematic sampling - the systems analyst would, for example, choose to interview every kth person on a list of company employees. a systems analyst would not use this approach if the list were ordered, because bias would be introduced.
• Stratified sampling - are perhaps the most important to the systems analyst. it is the process of identifying subpopulations, or strata, and then selecting objects or people for sampling in these subpopulations. it is often essential if the systems analyst is to gather data efficiently.
• Cluster sampling - the systems analyst must select a group of people or documents to study. a sampling technique that involves selecting a number of clusters and then selecting a sample from each cluster.
• Investigation - is the act of discovery and analysis of data.
• Reports used for Decision Making - A systems analyst needs to obtain some of the documents that are used in running the business. These documents are often paper reports regarding the status of inventory, sales, or production.
• Performance reports - Most of this take on the general form of actual versus intended performance. One important function of performance reports is to assess the size of the gap between actual and intended performance.
• Records - it provide periodic updates of what is occurring in the business.