2013年7月质量管理试卷真题
卷面总分:100分
试卷年份:2013
是否有答案:有
作答时间: 150分钟
为了分析过程是否处于稳定状态,现每小时从过程抽取5个样品,已抽得30组样本,并得到各组的均值和极差Ri,且=458.4与=127.6,给定n=5时,A2=0.577。要求:(1)计算控制图的上下控制界限值及中心值。10-265/267(2)若绘制控制图并打点后发现有1个点子在上控制界限上,其它点均在界内且无异常排列,试判断过程是否稳定,并说明理由。10-267
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