区间统计：查看任意时段的 基金涨幅情况；
Interval statistics: time to see any of the funds or the situation;
如果只做粗略的工资统计，就会忽略一个事实，即郊区的生活成本要低于大城市，因此可能夸大地区间不平等的程度。
Crude income Numbers also ignore the fact that the cost of living is cheaper in rural parts than in big cities, which has the effect of exaggerating inequality.
置信区间的意义很直观，因为它们的大小表示可靠性：窄的区间表示统计数据比较精确，宽的区间表示统计数据不太确定。
Confidence intervals are intuitive because their size indicates reliability: short intervals indicate that the statistic is precisely known, while wide intervals indicate uncertainty.
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