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    Statistics Statistics Presentation Transcript

    • Statistics note
    • Software can’t think for you•
    • Pie Charts• 片slice大,说明频率frequency高
    • Bar Charts
    • Histogram• 跟bar charts不一样:无间隙
    • cumulative frequency 积累频率• 不停累积数值
    • 趋势
    • Mean 平均值•
    • • outliers 异常值
    • Finding the median 找中位线• 方法:排序,找中间值
    • mean and median exercise• If you had to pick one age to represent this class, what would it be? Why? – 两个不同的年龄段,不能只用一个数值来表示• What if you could pick two ages instead? Which two ages would you pick, and why? – 2和32
    • mode• 频率最高的叫mode