204 1.4%2c1.5 errors in sampling experimental design

204 1.4%2c1.5 errors in sampling experimental design - 1.5...

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1.5 Sources of Errors in Sampling Non Sampling (Biased) Errors 1) Bias in the selection of individuals to be included in the sample population (e.g. incomplete frame) 2) Bias in the selection of individuals from the sample population. These are errors after the sample population is determined (e.g. convenience sampling, and self selection including nonresponse) 3) Poorly worded questions (biased, confusing, and order of Questions e.g. are you in favor of not disestablishing property tax supported public education) 4) Inaccurate responses (e.g. height and weight on driver’s licenses or reported incomes) Sample size errors A sample does not contain all the information for a population and thus is not completely accurate 1.6 Experimental Design Explanatory variables - the cause variables Response variables – the effect variables Their values are determined by the explanatory variables Observational versus Experimental studies In an observational study the researchers merely observe the values of the variables as they
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204 1.4%2c1.5 errors in sampling experimental design - 1.5...

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