The director of Human Resources at a large company wishes todetermine if newly instituted training has been effective inreducing work-related injuries. In a random sample of 100 employeestaken from the six months before this training began (group 1), shefound 15 had suffered a work-related injury. Using a random sampleof 150 employees from the six months since the training began(group 2), she found 12 had suffered a work-related injury.
a) Find the 95% confidence interval for thissituation.
b) Does it support the idea that the proportion of work-relatedinjuries has decreased with the new training?
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