对于单词的理解

问题如下：

A company uses EWMA to estimate volatility day-by-day. What would be the general effect of changing the volatility parameter from 0.94 to (a) 0.84 and (b) 0.98?

解释：

(a) The day-to-day changes in the volatility estimates would be more variable; (b) the day-today changes in the volatility estimates would be less variable.

题目问：一个公司用EMWA来估计每天的波动率，当波动率参数从0.94变成0.84，或者0.98时，会有什么影响？

当λ变小时，波动会变大；

当λ变大时，波动会变小。