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Powder samples provided by the subject meaningful sample data distribution observed relative frequency distributions referred empirical distribution The distribution of sampling the sample standard deviation of the mean variance of a thin sample sample sample statistics are obeyed. The overall distribution of distribution theory pointing to obey can have a refreshing angle expression, the expression change is generally friendly fight with specific parameters of frequency distribution function. District go to the interval estimate of the population parameter test paper sample statistics constructed. Select the analysis to explore get to explore the dialog box, click the Statistics button to select the output statistics can be obtained, check the description of the options can be output quality. Heart of a set of 95, the user can click the Continue button to explore the dialog needed to change, then click the button from the results that the browser can explore the process, uncle uncle uncle chose to intercede head, will you play Doom output stem and leaf get along, so we outlined here describe the form of the mean percent. Only 15 confidence interval meaning that, if we repeat drawn from a population capacity of security of the sample 100, then 100 from the sample mean confidence interval sample data consisting of at least 95, will contain the population mean.