Lecture_09_28

Lecture_09_28 - Lecture of September 28 From Last Class Why...

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1 Lecture of September 28 Lecture of September 28 •F r o m L a s t C l a s s - Why we need statistical inference? - Three types of inference methods - A four-step procedure • HW#4 due in class on 10/03.
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2 Procedures for Inferences Procedures for Inferences Basic Procedure (1) Collect random sample data from a population; (2) Calculate some statistic (typically some point estimate) from the sampled data that is related to the population parameters; (3) Determine the distribution of that statistic (4) Follow certain procedure, make inference (or conclusion) regarding the population parameters using (a) confidence intervals; or (b) hypothesis test method.
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3 Consider Normal Distribution Consider Normal Distribution •L e t x denote a quality characteristic that follows N ( µ , σ 2 ), where µ and σ 2 are the population parameters we'd like to know about. (1) Let { x 1 , x 2 , …, x n } be a random sample of n observations, (2) Point estimate of µ , σ 2 , and σ -- these are statistics related
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This note was uploaded on 02/14/2011 for the course ISEN 314 taught by Professor M during the Fall '10 term at Texas A&M.

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Lecture_09_28 - Lecture of September 28 From Last Class Why...

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