COMM 215 Lecture Notes - Lecture 7: Statistical Parameter, Simple Random Sample, Point Estimation
Document Summary
Point and con dence interval estimates for a population mean. Point estimate: a single statistic, determined from a sample that is used to estimate the corresponding population parameter. Sampling error: the difference between a measure (a statistic) computed from a sample and the corresponding measure (a parameter) computed from the population. A con dence interval is developed from sample values such that if all possible intervals of a given width were constructed, a percentage of these intervals, known as the con dence level, would include the true population parameter. Population parameter can be estimated with sample statistic (point estimate) mean: (pop), x (sample) proportion: p (pop), p (sample) Con dence interval estimate for the population mean, known. 2- the population does not have a normal distribution or the distribution of the population is not known. 1 - the simple random sample is drawn from a normal distribution.
