Enumerative vs. analytic studies

According to W. E. Deming (1975b), an enumerative study is one in which action will be taken on the material in the frame studied , where frame is defined as an aggregate of identifiable units of some kind, any or all of which may be selected and investigated. The frame may be lists of people, areas, establishments, materials, or other identifiable units that would yield useful results if the whole content were investigated . Thus, the frame defines a specific, well-defined population about which inferences can be made. The correctness of statistical inferences requires random sampling from this population. 

In general, inferences about the future of processes that have been brought to a state of statistical control are more reliable than inferences about poorly behaved systems [W. Deming (1982), Wheeler (1983), Wheeler and Chambers (1986), Wheeler (1987)]. 

Draw frequency histograms at intervals of 0.1 for the data in Problems 3.1 and 3.2. Calculate the variance and standard deviation for each of the two sets of data. 

Use Equation 3.8 to draw a gaussian curve over each of the histograms in Problems 3.3. Do the gaussian curves describe both sets of data adequately  

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