Do these data provide enough evidence at the1% significance level to infer that the amount oftime wasted in unsuccessful firms exceeds that ofsuccessful ones?

ne factor in low productivity is the amount of time wasted by workers. Wasted timeincludes time spent cleaning up mistakes, waitingfor more material and equipment, and perform-ing any other activity not related to production.In a project designed to examine the problem, anoperations-management consultant took a surveyof200 workers in companies that were classified assuccessful (on the basis of their latest annual profits)and another 200 workers from unsuccessful compa-nies. The amount of time (in hours) wasted during astandard 40-hour workweek was recorded for eachworker.a. Do these data provide enough evidence at the1% significance level to infer that the amount oftime wasted in unsuccessful firms exceeds that ofsuccessful ones?b. Estimate with95% confidence how much moretime is wasted in unsuccessful firms than in suc-cessful ones

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