求助！这组数据怎么分析CPK啊！

测得一组数据（公差是：-0.15/+0.15），上司说要做一下CPK分析，这组数据不从正态分布。用BOX-COX转换时说是数据必须大于0.所以想请教怎么分析CPK呢？
另外，如果用正态的方法分析了非正态的数据的话会造成什么后果呢？谢谢了！
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0