[計量] For which symptom are the ...
一種治療方法去治療五種症狀
分別是 H L P T V
病人被詢問的情況有下列五種ratings
2 much better
1 somewhat better
0 neither better nor worse
-1 somewhat worse
-2 much worse
symptom sum of 30 ratings standard deviation of 30 ratings
H 12 1.4
L 35 0.69
P -33 0.79
T -26 0.43
V 2 0.89
問題:for which symptom are the ratings closet to the arithmetic mean for
that symptom, as measured by the standard deviation of its ratings?
A) H
B) L
C) P
D) T
E) V
ans:D
看了好久都看不懂..
哪位強者可以幫我解惑一下
感謝你!!
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