which is more reasonable to use regression analysis and sample mean or sample variance what is the difference between a simple estimate and a regression how to estimate the variance of a normal population? which method should be used to estimate population variance what is the correct estimate of variance and mean what is the difference between a normal and an average model how is sample variance estimated when to use sample mean and variance as an estimate what is the difference between a standard sample size and a regression model for an average population? how is variance estimated for a sample in a sample what is the difference between a regression model and an estimate of the variance? when using regression model to estimate population when to use the sample variance and variance how to determine the variance of a sample how to estimate variance in a population why do we use regression analysis of a population when to use the sample variance in a population which approach is reasonable when using a simple model of population variance? why use the sample variance of the population when using sample data the model is used to estimate the mean or variance of the population.