which of the following are true statements?i.All symmetric histogram have single peaks.ii.All symmetric bell-shaped curves are normal.iii.All normal curves are bell-shaped and symmetric.btw:bell-shaped curve不是本来就symmetric吗,为啥题目

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whichofthefollowingaretruestatements?i.Allsymmetrichistogramhavesinglepeaks.ii.Allsymmetricbell-shap

which of the following are true statements?i.All symmetric histogram have single peaks.ii.All symmetric bell-shaped curves are normal.iii.All normal curves are bell-shaped and symmetric.btw:bell-shaped curve不是本来就symmetric吗,为啥题目
which of the following are true statements?
i.All symmetric histogram have single peaks.
ii.All symmetric bell-shaped curves are normal.
iii.All normal curves are bell-shaped and symmetric.
btw:bell-shaped curve不是本来就symmetric吗,为啥题目还要指出啊,另外可以给一下normal curve的定义吗!

which of the following are true statements?i.All symmetric histogram have single peaks.ii.All symmetric bell-shaped curves are normal.iii.All normal curves are bell-shaped and symmetric.btw:bell-shaped curve不是本来就symmetric吗,为啥题目

对称直方图可以有多个峰

bell-shaped 不是科学的描述,只是对形状的直观感觉.二次函数也可以说是bell-shaped,所以不一定是normal curve

this is the true statement

关于“ bell-shaped curve不是本来就symmetric吗”

    bell-shaped curve 在不同语境(教材)下有不同的定义,比如我可以认为chi-squared  

    distribution 也是bell-shaped curve,但是它不对称.但无论你定义中的bell-shaped curve是否对

    称,都不影响2错3对.

normal curve的定义,就是gaussian function:  http://en.wikipedia.org/wiki/Gaussian_function

   

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