Question: For question 27 to 31, the following data represents the number of defects produced before and after quality training in 7 different industrial plants. You

For question 27 to 31, the following data represents the number of defects produced before and after quality training in 7 different industrial plants. You would like to see if the training is effective in reducing defects. Before is set 1, after is set 2. Assume normality. Before 13, 15, 18, 11, 13, 12, 14 After 13, 16, 16, 12, 11, 13, 16 27. What is the null hypotheses?

a. u1-u2 = 0 b. uD = 0 or uD<=0 c. Dbar= 0 d. uD not =0

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