Topic_6.1___Statistical_Inference___Estimation___Examples

Topic_6.1___Statistical_Inference___Estimation___Examples -...

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Large Sample Estimation – Examples Ash Genaidy
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Large Sample Estimation for the Mean Calculate a 95% confidence interval for the following age information mean = 43.66 yr sd = 9.2 yr confidence interval = = calculate Z ) ( n sd Z Y ± ) 35 2 . 9 ( 66 . 43 Z ±
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T table
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Large Sample Estimation for the Mean Confidence interval = = (40.61, 46.71) ) 35 2 . 9 ( 96 . 1 66 . 43 ±
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Sample Size calculation for the Mean Estimation Suppose that the population mean should be within ± 1 yr from the mean. What should be the corresponding sample size for 95% confidence interval? n = (1.96*9.2) 2 = 325 individuals ) 2 . 9 ( 1 n Z =
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Large Sample Confidence Interval
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Unformatted text preview: for Proportion Calculate a 95% confidence interval for the following proportion of smokers = 0.457 Standard deviation = = 0.498 Standard Error = Confidence Interval = 0.457 ± 1.96*0.0842 =0.457 ± 0.165 = (0.292, 0.622) 248 . ) 457 . 1 ( 457 . ) ˆ 1 ( ˆ =-× =-π π 0842 . 35 498 . = Sample Size Calculation for Proportion Estimation Suppose that the population proportion should be within ± 0.10 from the sample proportion n = = 95 individuals n 498 . 96 . 1 1 . × = 2 ) 1 . 498 . 96 . 1 ( ×...
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