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Clearnote
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Senior High
Mathematics
為什麼Sxx不用先減算術平均數在平方
Mathematics
Senior High
about 3 yearsago
🎶
為什麼Sxx不用先減算術平均數在平方
5. 有兩筆資料 x,y如下表,若依最小平方法,y對x的迴歸直線為y=2+bx,則數對 (k,b) = (77) To 9+k-8€20b 6 120-25 = √95 5 X y 2 4 1 | 3 4 16 36 64 8 MX-5 k ES Wy=9+1 4² Sxx = 4+16+36+ 64-4x5=20 Sxy=3k-5b+2=4 20b=3/-1 56=2 beg 13-2 56+2=941 sob+8=4+k 20b-1=1 k=l, bato STYS 19 303 X
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