Lecture_10_03

# Lecture_10_03 - Lecture of October 03 From Last Class -...

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1 Lecture of October 03 Lecture of October 03 •F r o m L a s t C l a s s - Confidence intervals - Percentile point of a standard normal distribution, z α • HW#4 due today and HW#5 assigned and due in class on 10/10.

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2 Procedures for Inferences Procedures for Inferences Basic Procedure (1) Collect 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 .
3 Hypothesis Testing Hypothesis Testing Another way in which we can draw conclusion about the population parameter based on sampled data is to develop certain hypothesis test regarding the parameter. People sometimes establish an analogy between the hypothesis test with the criminal court system.

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4 Analogy Analogy 1) Assume “innocence” 2) Present evidences during a trial 3) Declare guilty (i.e. reject innocence) when strong evidence supports “beyond reasonable doubt” Otherwise, declare "not guilty." 1) Assume H 0 is true 2) Obtain sample data for test 3) Reject H 0 if the sample data show that H 0 is not true with strong statistical evidence. Otherwise, accept H
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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_10_03 - Lecture of October 03 From Last Class -...

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