Math 203_Lecture 15

Math 203_Lecture 15 - Principles of Statistics 1 Lecture...

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Unformatted text preview: Principles of Statistics 1 Lecture 15: Math 203 Abbas Khalili Department of Mathematics and Statistics McGill University May 26, 2011 Principles of Statistics 1 Lecture 15: Math 203 p. 1/1 2 Determining the sample size As in Chapter 7, we can find the appropriate sample size to estimate the difference between a pair of parameters with a specified sampling error ( SE ) and degree of reliability (confident). Principles of Statistics 1 Lecture 15: Math 203 p. 2/1 2 Determining the sample size As in Chapter 7, we can find the appropriate sample size to estimate the difference between a pair of parameters with a specified sampling error ( SE ) and degree of reliability (confident). Since in estimating the difference between a pair of parameters we use two samples, we need to decide about the appropriate sizes of two samples. Principles of Statistics 1 Lecture 15: Math 203 p. 2/1 2 Determining the sample size As in Chapter 7, we can find the appropriate sample size to estimate the difference between a pair of parameters with a specified sampling error ( SE ) and degree of reliability (confident). Since in estimating the difference between a pair of parameters we use two samples, we need to decide about the appropriate sizes of two samples. In what follows we determine the sample sizes such that n 1 = n 2 = n . Principles of Statistics 1 Lecture 15: Math 203 p. 2/1 2 Recall: Chapter 7 To estimate a population mean with a specified sampling error (SE) and with 100(1- )% confidence, Principles of Statistics 1 Lecture 15: Math 203 p. 3/1 2 Recall: Chapter 7 To estimate a population mean with a specified sampling error (SE) and with 100(1- )% confidence, the required sample size n is n = ( z / 2 ) 2 2 ( SE ) 2 . Principles of Statistics 1 Lecture 15: Math 203 p. 3/1 2 Determining the sample size when estimating 1- 2 To estimate 1- 2 to within a specified sampling error SE and with confidence level 1- , equal sample sizes from each of the populations 1 and 2 are Principles of Statistics 1 Lecture 15: Math 203 p. 4/1 2 Determining the sample size when estimating 1- 2 To estimate 1- 2 to within a specified sampling error SE and with confidence level...
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This note was uploaded on 07/15/2011 for the course MATH 203 taught by Professor Dr.josecorrea during the Summer '08 term at McGill.

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Math 203_Lecture 15 - Principles of Statistics 1 Lecture...

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