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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![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](/uploads/image/z/5656720-40-0.jpg?t=which+of+the+following+are+true+statements%3Fi.All+symmetric+histogram+have+single+peaks.ii.All+symmetric+bell-shaped+curves+are+normal.iii.All+normal+curves+are+bell-shaped+and+symmetric.btw%EF%BC%9Abell-shaped+curve%E4%B8%8D%E6%98%AF%E6%9C%AC%E6%9D%A5%E5%B0%B1symmetric%E5%90%97%2C%E4%B8%BA%E5%95%A5%E9%A2%98%E7%9B%AE)
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