Originally Posted by
dethuong_x0x
Lam` on* dich. giup' to*' may^' cai' nay` voi*'
-It's often useful to know how many standard deviations a data point is from the mean . We define z-scores ,or standardized scores , as distance from x-(mean) per standard deviation .
-A z-score of +2 means that an observation is 2 standard deviations above the mean . For the weight data (x-(mean)=145.2 and s=23.7) , we can plot the data on the origional x-axis in pounds and the z-score axis simultaneously .
x-(mean) là chữ X có cái gạch trên đầu ý ( em ko biết viết )(có ai biết chỉ em lun với)