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Unformatted text preview: Sheet1 Page 1 AGENDA Paired-T test Extra credit Review Optional Homework Return Quizzes Quiz PAIRED T-TEST 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 T-TEST EAMPLE 3PAIRED T-TEST 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