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A light-aircraft engine repair shop switched the payment method it used from hourly wage to hourly wage plus a bonus computed on the time required to disassemble, repair, and reassemble an engine. The following are data collected for 25 engines before the change and 25 after the change. At a 0.05 significance level, did the new plan increase productivity? Hours Required Before After 29 32 34 Hours Required Before After 25 34 42 27 20 26 19 32 22 19 21 25 31 25 20 33 22 31 24 34 19 28 25 20 22 31 31 21 32 32 18 22 31 4 22 45 30 41 24 43 29 23 26 31 20 34 41