I Acceptable Error for the example Decision makers frequently use a 570 significance level -Usea=0.05 An a-error means that we will decide to adjust the machine when it does not need adjustment This means, in the case of the robot welder if the machine is running properly, there is only a 0.05 probability of our making the mistake of concluding that the robot requires adjustment when it really does not o 2002 The Wadsworth GroupAcceptable Error for the Example • Decision makers frequently use a 5% significance level. – Use a = 0.05. – An a-error means that we will decide to adjust the machine when it does not need adjustment. – This means, in the case of the robot welder, if the machine is running properly, there is only a 0.05 probability of our making the mistake of concluding that the robot requires adjustment when it really does not. © 2002 The Wadsworth Group