Chapter_06 cont - STEPS IN THE SAMPLING PROCESS Define the...

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STEPS IN THE SAMPLING PROCESS Define the Population Specify Sampling Frame Specify Sampling Method Determine the Sample Size
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Sample Size Determination All You Can Afford Approach Statistical Approach national samples (1,000 - 1,200 respondents) regional samples (500 - 600 respondents) local samples (350 - 450 respondents)
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STEPS IN THE SAMPLING PROCESS Define the Population Specify Sampling Frame Specify Sampling Method Determine the Sample Size Specify Sampling Plan
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STEPS IN THE SAMPLING PROCESS Define the Population Specify Sampling Frame Specify Sampling Method Determine the Sample Size Specify Sampling Plan Select the Sample
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Factors Affecting Sample Size for Probability Designs Variability of the population characteristic under investigation Level of confidence desired in the estimate Degree of precision desired in estimating the population characteristic
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When estimating a population mean n = (Z2CL)(σ2/e2) When estimates of a population proportion are of concern n = (Z2CL)([P x Q]/e2) Probability Sampling and Sample Sizes
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