Lecture 12

# Lecture 12 - Z-Score Notation z() is the z value with area...

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Z-Score Notation z( α ) is the z value with area α to the right. z(0.05) is the z value above which you have area 0.05. Find z(0.05) and z(0.95).

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Find z( α /2) if α = .05. α /2 = .05 / 2 = .025
Introduction to Statistical Inferences The object of inferential statistics is to use the sample data to increase our knowledge of the sampled population. The cases we deal with are ones where the mean of the population is not known. Nature of Estimation Point Estimate: An estimate of a population parameter given by a single value calculated from sample data. Unbiased Statistic: A statistic is said to be unbiased if the mean of the sampling distribution is equal to the population parameter that it estimates. Example: X estimates µ (sample mean estimates the population mean) X is unbiased as X = µ X has low variability since σ X = σ (not seen)

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√n Interval Estimation We have a method of constructing an interval that will contain the population parameter a certain proportion of the time. This proportion
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## This note was uploaded on 02/15/2009 for the course STAT 2004 taught by Professor Melutz during the Fall '07 term at Virginia Tech.

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Lecture 12 - Z-Score Notation z() is the z value with area...

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