单选题 A project management team is evaluating the causes that might contribute to unsatisfactory performance and quality．Which of the following statements is not true?

A、 Normal process variation is attributable to random causes and sometimes also called“white noise”．
B、 Special causes are easier to predict and handle than random causes(also called common caus
C、 Special causes are unusual events which are difficult to foresee and mostly produce outlier
D、 A process can be optimized to limit the bandwidth of variations due to random cause

【正确答案】 B

【答案解析】[解析] 项目管理团队正在评估可能导致不符合要求的绩效和质量的原因。下列哪个说法不正确? A) 正常过程的随机偏差可归属于随机原因，有时候被称为“白噪声”。 B) 特殊原因比随机原因(普通原因)容易被预知和控制。 C) 特殊原因是非常规事件，很难预见，经常导致问题。 D) 过程的随机原因的偏差可以被限制于接受边界之内。其他三个都是关于控制图的描述。