A plant manager has collected productivity data for a sample of workers, intending to see whether there is a difference in the number of units they produce on Monday versus Thursday. The results (units produced) worker 1 3 4 6 7 8 9 Monday Thursday Given that standard deviation for the difference between the two sets is 3.767. Construct and interpret the 99% confidence interval for the mean difference in productivity between the days. 49 56 52 47 69 71 54 42 46 59 65 57 54 71 70 49 43 O a.- 1.22 ± 2.335 O b.- 1.22 + 4.213 O C.- 1.22 ± 2.066 O d.- 1.22 ± 12.63 O e.- 1.22 ± 7.005

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