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Question: the quality of a certain controller at the silesian university...

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The quality of a certain controller at the Silesian University of Technology was tested before and after the improvement on the number of objects. The table below presents the times of achieving the set point before and after the improvement. Using an appropriate statistical test, check if there is a significant change in the adjustment time. Assume that significance level is equal to 4%. Number of tested object 2345 617:8 9 : 10 | 11 | 12 Time before improvement90 93 89 65 77 108 87 94 67 Isl Time after improvement
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