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Unformatted text preview: Sheet1 Page 1 AGENDA PairedT test Extra credit Review Optional Homework Return Quizzes Quiz PAIRED TTEST Use Compare before& and 2 after paired results n1 and n2 must be equal Assuming normality of populations Data is not independent, pairs are correlated Examples Worker knowledge before and after a training program Productivity before and after the installation of new equipment Measurement of samples between two instruments Calculate summary statistics Calculate the difference between the & before and afterX values for each observation D bar is the average of the differences between obs varD is the variance of the differences between obs PAIRED TTEST EAMPLE 3PAIRED TTEST Weekly losses of worker hours due to accidents in 10 different industrial plants before and after a safety program Use alpha=0.05 to determine if the program is effective Difference in accidents Plant1 2 3 4 5 6 7 8 9 10 Before45, 73, 46, 124, 33, 57, 83, 34, 26, 17 After 36, 60, 44, 119, 35, 51, 77, 29, 24, 11...
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This note was uploaded on 11/21/2010 for the course INDE 2333 taught by Professor Staff during the Fall '08 term at University of Houston.
 Fall '08
 Staff

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