In September of 1996, United States Congress directed the National Highway Traftic Safety Administration (NHTSA) to conduct a feasibility study toward establishing a Federal Motor Vehicle Safety Standard (FMVSS) for frontal offset crash testing. Congress stated that these activities should reflect ongoing efforts to enhance ir ternational harmonization of safety standards. The offset c~.:.sh te...

In most situations the best estimator of a function of the parameter exists, but sometimes it has a complex form and we cannot compute its variance explicitly. Therefore, a lower bound for the variance of an estimator is one of the fundamentals in the estimation theory, because it gives us an idea about the accuracy of an estimator. It is well-known in statistical inference that the Cram&eac...

abstract:introduction: racial and environmental differences in communities leading cause of differences in serum lipids. it can be said this study aimed in assessing percentile curves of serum lipid profile about 6-18 years old students of birjand.method: the present cross-sectional study was done on 4168 students of birjand aged 6-18 years. they were classified into three age groups 6-10 and 1...

we develop a two phase sampling procedure to determine the sample size necessary to estimatethe population mean of a normally distributed random variable and show that the resulting estimator has preassigned variance and is unbiased under a regular condition. we present a necessary and sufficient condition under which the final sample mean is an unbiased estimator for the population mean.