Data Collection And Recording Stage

1504 WordsNov 3, 20167 Pages
Business Statistics Answer 1. A sampling plan is a detailed outline of which measurements will be taken at what times, on which material, in what manner, and by whom. Data collection and recording stage : these include sampling plan data collection and data representation. Random sampling The concept of randomness Before we discuss random sampling, you need to be clear about the exact meaning of "random." In common speech, it means "anything will do", but the meaning used in statistics is much more precise: a person is chosen at random from a population when every member of that population has the same chance of being sampled. If some people have a higher chance than others, the selection is not random. To maximize accuracy, surveys conducted on scientific principles always use random samples. Imagine a complete list of the population, with one line for every member: for example, a list of 1500 members of an organization, numbered from 1 up to 1500. Suppose you want to survey 100 of them. To draw a simple random sample, choose 100 different random numbers, between 1 and 1500. Any member whose number is chosen will be surveyed. If the same number comes up twice, the second occurrence is ignored, as nobody will be surveyed more than once. So if the method for selecting random numbers can produce the same number twice, about 110 selections will need to be made to get 100 people. Another type of random sampling, called systematic sampling, is more commonly used. This

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