STAT 2000 Chapter Notes -Standard Deviation, Sampling Distribution, Central Limit Theorem
18 Mar 2014
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Inference for the mean of a single population pt 1. Vocab: cases = objects described by data set. Separate each observation into stem = all but the rightmost digit leaf = final digit. Leafs = contain only a single digit. Distribution of a variable = what values it takes / how often it takes these values. Stemplots and histograms display the distributions of quantitative variables. For clear deviations from the overall shape. The number of modes (major peaks) is another aspect of overall shape. Sample means less variable than individual observations: more normal than individual observations. The sample mean population. from a sample / xperiment is an estimate of the mean. Mean / standard deviation of a sample mean is the mean of a srs of size n from a population having mean and standard deviation . If a population has the n( , ) distribution, then sample mean of n independent observations has the distribution.
