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95 percent confidence advance of sampling Appendix Table approximate 95 percent assumed assumption base period binomial distribution binomial parameter binomial population CD CD CD CD CM Chi-square distribution CM CD CM CM CM confidence coefficient Contingency Table critical region cumulative distribution function degrees of freedom elements Estimation of Volume finite population follows formula frequency function intersection Interval Estimation lOOa percent point lower and upper median normal populations null hypothesis number of vehicles observed value obtained order statistics percent confidence interval percent confidence limits point estimate Poisson distribution population mean preassigned quantity random digits random number random sample random selection random variable regarded rejected relative error row of Appendix sample mean sample variance selected value short counts short-count period significance level significance test specified speeds standard deviation standard normal distribution Suppose systematic sample tion traffic engineering two-sided vehicles passing xlt x2