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Dependent Samples Air Compressor Assembly Paired-t or "before and after" hypothesis test: And industrial engineer is evaluating a new method if assembling air compressors. A sample of 8 employees is selected at random and we record the mean number of compressors produced in one week using the existing (old) procedures. The same 8 workers (thus dependent samples) are trained to use the new production method and output for one week is then recorded using the new method See production results below. Production Before: Production After Employee Using the Old Using the New d d-d ( d-d)2 Assembly Method Assembly Method 80 85 80-85= -5 -5-(-2) = -3 9 88 84 88-84= +4 4- (-2) = 6 36 76 80 76-80= -4 -4- (-2) = -2 4 90 93 -3 InTMOnWP 74 83 -9 you fill in 70 71 -1 Section 81 79 +2 O 83 83 O - (-2)=2 4 + Ed=- 16 2 (d-2)?= 120 Test at the 10% level of significance to see if there is a difference in production between the two assembly methods