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Determination of Sample Size
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... possess unique expectation. More specifically, the expectation (uniquely defined for most other distributions) of a Cauchy distribution is everywhere on the real line. The sample space of a Cauchy random variable balances at any point! This is at first very hard to explain because the density clear ...
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... 4) The Wall Street Journal stated that the cost to repair a vacuum cleaner was $54, nationally. In a random sample of 25 vacuum repair jobs in Plano, the mean repair cost was $56.29 with a standard deviation of $6.41. Assume repair costs are normally distributed. Does this indicate the he cost of va ...
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History of statistics

The History of statistics can be said to start around 1749 although, over time, there have been changes to the interpretation of the word statistics. In early times, the meaning was restricted to information about states. This was later extended to include all collections of information of all types, and later still it was extended to include the analysis and interpretation of such data. In modern terms, ""statistics"" means both sets of collected information, as in national accounts and temperature records, and analytical work which requires statistical inference.Statistical activities are often associated with models expressed using probabilities, and require probability theory for them to be put on a firm theoretical basis: see History of probability.A number of statistical concepts have had an important impact on a wide range of sciences. These include the design of experiments and approaches to statistical inference such as Bayesian inference, each of which can be considered to have their own sequence in the development of the ideas underlying modern statistics.
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