CQE题目请教

1. When sample size is increased,the operating characteristic curve will

a)steepen b)flatten
c)remain unchanged d)reduce discrimination

2) If a process has a variance of 4 units and a specification of 96+/_4,what is the process performance index(Pp)?
a)0.33 b)0.66
c)1.00 d)1.50

答案分别是a和b。
请教高手解答，并说明原因。谢谢！